>>> TONIGHT OUR SPECIAL EDITION OF "NIGHTLY NEWS" FROM INSIDE IRAN. MY EXCLUSIVE INTERVIEW WITH IRAN'S PRESIDENT AHEAD OF THAT EXPECTED PRISONER SWAP WITH THE U.S. THOSE FIVE AMERICANS WAITING TO BE EXCHANGED FOR FIVE IRANIANS DETAINED IN THE U.S. WHAT IRAN'S PRESIDENT TOLD ME ABOUT THE AMERICANS' CONDITIONS AND WHEN THEY MIGHT BE RELEASED. AND THE CONTROVERSY OVER HOW HE SAYS IRAN WILL SPEND $6 BILLION IN FUNDS THE U.S. WILL UNFREEZE AS PART OF THE DEAL. HOW WASHINGTON IS REACTING. >>> ALSO TONIGHT, HOUSE SPEAKER KEVIN McCARTHY ORDERING AN IMPEACHMENT INQUIRY PRESIDENT BIDEN AND ALLEGING A CULTURE OF CORRUPTION INVOLVING HIS SON HUNTER. DOES HE HAVE THE VOTES TO IMPEACH? >>> POLICE WARNING THAT ESCAPED KILLER IN PENNSYLVANIA IS NOW ARMED AND EXTREMELY DANGEROUS AFTER STEALING A RIFLE FROM A GARAGE. THE HOMEOWNERS EVEN SHOT AT HIM. >>> CATASTROPHIC FLOODS IN LIBYA. THOUSANDS FEARED DEAD. A STATE OF EMERGENCY IN MASSACHUSETTS. HEAVY RAINS WASHING OUT ROADS. CARS SWALLOWED BY SINK HOLES. THE NEW THREAT ON THE WAY. >>> WHO SHOULD GET THE NEW COVID SHOTS? THE SURPRISING GUIDANCE JUST OUT FROM THE CDC. >>> THE FDA REVIEW, FINDING A KEY INGREDIENT IN POPULAR COLD MEDICINES DE EVER PLAY AGAIN? >> Announcer: THIS IS "NBC NIGHTLY NEWS" WITH LESTER HOLT. REPORTING TONIGHT FROM INSIDE IRAN. >> GOOD EVENING FROM TEHRAN, THE CAPITAL OF IRAN, A COUNTRY ECONOMICALLY ISOLATED FROM MUCH OF THE WESTERN WORLD AND CONSIDERED A MILITARY AND GEOPOLITICAL RIVAL, SOME WOULD EVEN SAY ENEMY OF THE UNITED STATES. I SAT DOWN WITH THE COUNTRY'S PRESIDENT FOR AN EXCLUSIVE AND EXTREMELY RARE INTERVIEW TODAY. AND WHAT HE TOLD ME IS ALREADY SENDING SHOCKWAVES THROUGH WASHINGTON, D.C. WE'LL GET TO THAT IN A MOMENT. >>> THE OTHER SURPRISE IN WASHINGTON CAME FROM SPEAKER OF THE HOUSE KEVIN McCARTHY, ANNOUNCING TODAY THAT HE IS ORDERING AN INQUIRY INTO IMPEACHING PRESIDENT BIDEN. THE ORDER GIVES HOUSE REPUBLICANS LICENSE TO INVESTIGATE THE PRESIDENT AND HIS FAMILY'S BUSINESS DEALINGS. THE WHITE HOUSE CALLING THE MOVE EXTREME POLITICS AT ITS WORST. McCARTHY ALLEGING CORRUPTION AND ABUSE OF POWER ON THE PART OF THE PRESIDENT. BUT DOES HE HAVE THE EVIDENCE AND THE VOTES? GARRETT HAAKE STARTS US OFF TONIGHT FROM CAPITOL HILL. >> Reporter: TONIGHT HOUSE REPUBLICANS RAMPING UP THEIR INVESTIGATION INTO PRESIDENT BIDEN AND HIS FAMILY. SPEAKER KEVIN McCARTHY DIRECTING THREE GOP-CONTROLLED COMMITTEES TO OPEN AN IMPEACHMENT INQUIRY. >> THESE ARE ALLEGATIONS OF ABUSE OF POWER, OBSTRUCTION, AND CORRUPTION. AND THEY WARRANT FURTHER INVESTIGATION BY THE HOUSE OF REPRESENTATIVES. >> Reporter: HOUSE REPUBLICANS HAVE ALLEGED THAT THE PRESIDENT HAS PROFITED OFF THE FOREIGN BUSINESS DEALINGS OF HIS SON HUNTER AND LIED ABOUT IT, BUT HAVE PROVIDED NO DIRECT EVIDENCE TO PROVE THOSE CLAIMS, WHICH THE WHITE HOUSE HAS DENIED. >> THERE IS NO EVIDENCE OF WRONGDOING BY PRESIDENT BIDEN BECAUSE PRESIDENT BIDEN DIDN'T DO ANYTHING WRONG. >> Reporter: THE REPUBLICANS BELIEVE ELEVATING THEIR INVESTIGATIONS TO AN IMPEACHMENT INQUIRY IS NECESSARY TO OVERCOME WHAT THEY SAY IS WHITE HOUSE STONEWALLING IN THEIR VARIOUS PROBES. >> THERE IS ENOUGH SMOKE. THERE MAY BE A FIRE THERE. I THINK THIS IS THE LOGICAL NEXT STEP. >> THAT'S WHAT LEADERSHIP LOOKS LIKE, AND IT'S ABSOLUTELY THE RIGHT THING TO DO. >> Reporter: DEMOCRATS TONIGHT RALLYING TO THE PRESIDENT'S DEFENSE, ACCUSING REPUBLICANS OF SEEKING REVENGE FOR THE TWO IMPEACHMENTS OF DONALD TRUMP. >> THIS IS AN ILLEGITIMATE IMPEACHMENT INQUIRY, PERIOD, FULL STOP. >> Reporter: SOME OPENLY MOCKING THE GOP EFFORT AS UNSERIOUS, WITHOUT EVIDENCE OR A FULL HOUSE VOTE TO SUPPORT IT. >> OH, MY GOSH, YOU KNOW. OH, IT'S DEVASTATING. OOH, DON'T DO IT! PLEASE, DON'T DO IT. OH, NO, OH, NO. >> Reporter: AND TONIGHT THE COMMITTEE CHAIRMAN LEADING THE INQUIRY SAYS HIS FIRST STEP WILL BE PURSUING BANK RECORDS FOR HUNTER BIDEN AND THE PRESIDENT'S BROTHER. LESTER? >> GARRETT HAAKE STARTING US OFF, THANK YOU. >>> HERE IN IRAN TONIGHT, THE PIECES ARE NEARLY IN PLACE FOR A PRISONER SWAP BETWEEN THE U.S. AND IRAN. THE DEAL GENERATING CONTROVERSY TONIGHT AFTER IRAN'S PRESIDENT SUGGESTED TO ME IN AN EXCLUSIVE INTERVIEW THAT HIS COUNTRY WAS GETTING MORE FROM THE AGREEMENT THAN WAS FIRST REPORTED. THE U.S. NOW LOOKING TO SET THE RECORD STRAIGHT. WE ARRIVED IN TEHRAN AT A CRITICAL MOMENT, AS CONSEQUENTIAL AS IT IS CONTROVERSIAL. TONIGHT THE WHITE HOUSE MOVING QUICKLY TO FRAME THE DETAILS OF A PRISONER SWAP THAT WOULD UNLOCK $6 BILLION OF FROZEN IRANIAN FUNDS THAT THE U.S. SAYS WOULD BE FOR IRAN'S HUMANITARIAN USE ONLY, AFTER IRAN'S PRESIDENT EBRAHIM RAISI TELLING ME IN AN EXCLUSIVE INTERVIEW THAT IRAN WILL DO WHATEVER IT WANTS WITH THE MONEY. >> NO, THAT'S NOT TRUE. THE SYSTEM IS SET UP SUCH THAT THIS MONEY, THESE FUNDS CAN ONLY BE PARCELLED OUT FOR HUMANITARIAN PURPOSES. >> Reporter: TONIGHT THE FIVE AMERICANS AT THE CENTER OF THE DEAL HELD FOR YEARS ARE EXPECTED TO BE FREED AT ANY TIME. RECENTLY TRANSFERRED FROM A PRISON CELL, WHERE THEY HAD BEEN HELD ON ESPIONAGE CHARGES. THE U.S. SAYS THEY WERE UNJUSTLY DETAINED. NOW THEY WAIT TO BE EXCHANGED FOR FIVE IRANIANS HELD IN THE U.S. ON ALLEGED SANCTIONS VIOLATIONS. FOR IRAN, THE DEAL WILL FREE UP BILLIONS THAT HAD BEEN BLOCKED BY U.S. SANCTIONS. WALKING THE BUSY STREETS OF THIS CAPITAL, IT DOESN'T IMMEDIATELY STRIKE YOU HOW ISOLATED THIS COUNTRY IS, BUT IN FACT, IRAN IS THE SECOND MOST SANCTIONED COUNTRY IN THE WORLD. RUSSIA ONLY SURPASSED IT AFTER ITS INVASION OF UKRAINE. SPEAKING TO PRESIDENT RAISI THROUGH A GOVERNMENT-PROVIDED TRANSLATOR, I ASKED ABOUT THE WELL-BEING OF THE SOON TO BE FREED AMERICANS. >> ARE THEY HEALTHY? ARE THEY WELL? >> THEY ARE VERY HEALTHY. AND ACCORDING TO OUR LATEST INFORMATION, THEY ARE IN FULL HEALTH. >> I WANT TO ASK YOU ABOUT THE DEAL. $6 BILLION THAT IRAN HAS, ITS OWN MONEY FOR HUMANITARIAN PURPOSES. THERE ARE MANY IN THE UNITED STATES, MEMBERS OF CONGRESS WHO HAVE RAISED CONCERNS THAT THIS IS A RANSOM, THAT THIS IS APPEASEMENT OF IRAN, THAT IT WILL ONLY ENCOURAGE IRAN TO TAKE AMERICANS AND OTHER CIRCUMSTANCES AND FALSELY ACCUSE THEM. WHAT'S YOUR RESPONSE TO THAT? >> Translator: JUST FROM THE BEGINNING, WE HAVE BEEN INTENDING TO RELEASE THE IRANIAN FROZEN ASSETS WHICH HAVE BEEN UNJUSTLY FROZEN BY THE UNITED STATES TO FREE THEM. WE BELIEVE THAT THESE AMERICAN ACTION WAS VERY UNJUST, JUST FROM THE BEGINNING. IT HAS IMPOSED PRESSURE ON THE IRANIAN PEOPLE. >> YOU BELIEVE THIS MONEY WAS WRONGFULLY TAKEN FROM IRAN. BUT WHAT IS YOUR EXPECTATION OF ITS USE? WE'RE TOLD THAT IT'S FOR HUMANITARIAN PURPOSES, FOOD AND MEDICINE. DO YOU BELIEVE YOU HAVE THE RIGHT TO USE THAT MONEY IN ANY WAY THAT YOU SEE FIT? >> THIS MONEY BELONGS TO THE ISLAMIC REPUBLIC OF IRAN, AND NATURALLY, WE WILL DECIDE, ISLAMIC REPUBLIC OF IRAN WILL DECIDE TO SPEND IT WHEREVER WE NEED IT. >> SO IF I HEAR YOU CLEARLY, IT WILL BE USED FOR MORE THAN HUMANITARIAN PURPOSES IN YOUR VIEW? >> HUMANITARIAN MEANS WHAT DO THE IRANIAN PEOPLE NEED? SO THIS MONEY WILL BE BUDGETED FOR THOSE NEEDS. AND THE NEEDS OF THE IRANIAN PEOPLE WILL BE DECIDED AND DETERMINED BY THE IRANIAN GOVERNMENT. >> MEANTIME, IRAN HAS FACED INTERNAL TROUBLES, NAMELY A VIOLENT CRACKDOWN ON WOMEN'S RIGHTS PROTESTERS WHO WERE DEMANDING AN END TO A LAW THAT REQUIRES WOMEN HERE TO WEAR HEAD COVERINGS. THE PROTEST MOVEMENT LED BY WOMEN HERE. WE SAW MANY OPENLY DEFYING THE LAW. ARE YOU AT ALL AFRAID TO WALK DOWN THE STREETS WITHOUT A SCARF? >> NO, I DON'T HAVE AFRAID BECAUSE I AM REALLY TIRED ABOUT THIS. >> I ASKED THE PRESIDENT ABOUT THE DEADLY GOVERNMENT CRACKDOWN ON THOSE PROTESTERS. >> WE'RE SITTING HERE, MR. PRESIDENT, OF NEARLY THE ONE-YEAR ANNIVERSARY OF THE DEATH OF MAHSA AMINI, A YOUNG WOMAN ARRESTED BY THE MORALITY POLICE FOR IMPROPERLY WEARING A HEAD COVERING. THE GOVERNMENT RESPONSE TO PROTESTERS WAS SWIFT AND IT WAS BRUTAL IN THE EYES OF MANY. HUMANITARIAN GROUPS SAY AT LEAST 500 PEOPLE WERE KILLED, PERHAPS MANY YOUNG PEOPLE. THOUSANDS, TENS OF THOUSANDS WERE ARRESTED, THAT THERE WERE PEOPLE EXECUTED OR PUT ON DEATH ROW, JOURNALISTS WHO WERE ROUNDED UP. WHAT MESSAGE DID THAT SEND TO THE REST OF THE WORLD HOW IRAN HANDLED THOSE PROTESTS? >> Translator: IT WAS AN INCIDENT, THE SAME INCIDENTS HAPPEN EVERY DAY IN THE U.S. AND IN THE EUROPEAN CITIES BASED ON ISLAMIC REPUBLIC OF IRAN, DISBANDED AND FOLLOWED THE ISSUE. BUT I WOULD LIKE TO MENTION THE FACT THAT THE WESTERN COUNTRIES, AND SOME EUROPEAN COUNTRIES AND THE U.S. WERE MAKING USE OF THESE INCIDENT AS A PROJECT AGAINST THE ISLAMIC REPUBLIC OF IRAN. IT WAS A HYBRID WAR AND A COGNITIVE WAR. IT WAS A POLITICAL WAR. IT WAS AN ECONOMIC WAR, A MEDIA WAR, AND A PSYCHOLOGICAL WAR AGAINST ISLAMIC REPUBLIC OF IRAN. >> IF I UNDERSTAND WHAT YOU'RE SAYING, YOU'RE BLAMING WHAT HAPPENED ON THE STREETS AFTER MAHSA AMINI'S DEATH ON WESTERN INFLUENCES AND AMERICAN EFFORTS TO UNDERMINE THIS COUNTRY. BUT THOSE WERE IRANIAN SECURITY FORCES IN THE STREET FIRING PELLETS AT UNARMED PEOPLE OR LIVE WEAPONS AT CROWDS THAT INCLUDED YOUNG PEOPLE. DO YOU NOT SEE ANYTHING IN THE LAST YEAR IN WHICH YOU HAVE TO TAKE RESPONSIBILITY FOR? >> Translator: THOSE WHO PROVOKED THE PEOPLE AND MADE USE OF THESE OPPORTUNITIES, THAT WAS THE U.S. AND EUROPEAN COUNTRIES. THOSE WHO WERE TRYING TO LAY BLAME OR TO OPEN FIRE ON THE PEOPLE OR TO KILL PEOPLE, CERTAINLY, OUR SECURITY FORCE ON THE STREET CANNOT ALLOW TERROR. WE CANNOT ALLOW ANYONE TO DESTROY THE PUBLIC PLACES. WE CANNOT ENDANGER THE SAFETY OF PEOPLE. >> IF ON SATURDAY THE ANNIVERSARY OF MAHSA AMINI'S DEATH, IF THERE ARE PROTESTS TO COMMEMORATE THAT DATE, WOULD THE SECURITY FORCES CRACK DOWN IN THE SAME WAY? >> Translator: SO YOU KNOW THAT ARE THERE GOING TO BE ANY PROTESTS IN THE COUNTRY? >> I DON'T KNOW. THERE ARE REPORTS THE GOVERNMENT HAS TAKEN ACTIONS TO QUIET ACTIVISTS AHEAD OF THAT DATE. CAN YOU COMMENT ON THAT? >> Translator: YOU SHOULD BE ASSURED THAT THE ISLAMIC REPUBLIC OF IRAN HAS ALWAYS BEEN READY TO LISTEN TO WORDS OF PROTESTERS ON ANY ISSUES. WE ARE ALL EARS. AND THOSE WHO INTEND TO ABUSE MADAM AMINI'S NAME AND PROJECTS TO BE AN AGENT OF FOREIGNERS TO CREATE THIS INSTABILITY IN THE COUNTRY, WE KNOW WHAT WILL HAPPEN TO THEM, AND THEY KNOW THAT. ENDANGERING THE SECURITY OF PEOPLE, THE SECURITY OF SOCIETY WILL CREATE A BIG COST. >> IN THAT INTERVIEW, PRESIDENT RAISI TELLING ME THE PRISONER SWAP SHOULD BE FINALIZED IN, QUOTE, DUE TIME. PETER ALEXANDER JOINS US FROM THE WHITE HOUSE. PETER, WE HEARD THE BIDEN ADMINISTRATION RESPONSE, AND NOW REPUBLICANS ARE SPEAKING OUT. >> LESTER, REPUBLICANS HAVE SLAMMED THIS PRISONER SWAP, SAYING PRESIDENT BIDEN GAVE UP TOO MUCH, CALLING IT APPEASEMENT AND A RANSOM PAYMENT. FORMER PRESIDENT TRUMP IS BLASTING IT AS A TERRIBLE PRECEDENT TO RETURN $6 BILLION IN ADDITION TO RELEASING FIVE IRANIAN PRISONERS, ATTACKING PRESIDENT BIDEN AS INCOMPETENT. REPUBLICANS PROBABLY ARGUED THE DEAL WILL ONLY ENTICE ROGUE REGIMES LIKE IRAN TO DETAIN MORE AMERICANS. BUT THE WHITE HOUSE SAYS THE U.S. CAN REFREEZE THE MONEY IF NECESSARY AND SAYS THERE ARE STRICT MEASURES IN PLACE TO ENSURE HOW IT IS SPENT. LESTER? >> PETER ALEXANDER, THANK YOU. >>> ALSO OVERSEAS TONIGHT, THE DEADLY DISASTER IN LIBYA. AS MANY AS 10,000 FEARED DEAD AFTER MASSIVE FLOODS CAUSED DAMS TO BURST AND WASHED NEIGHBORHOODS OUT TO SEA. STATE MEDIA SAYS THE DEATH TOLL IN THE CITY OF DERNA ALONE IS MORE THAN 5,000. LIBYA IS SPLIT BETWEEN TWO RIVAL GOVERNMENT, POTENTIALLY COMPLICATING RELIEF EFFORTS. >>> BACK HOME, THERE ARE MAJOR NEW DEVELOPMENTS IN THE MANHUNT FOR AN ESCAPED KILLER IN PENNSYLVANIA. POLICE NOW SAY HE IS ARMED WITH A RIFLE HE STOLE FROM A GARAGE WHERE THE HOMEOWNER OPENED FIRE ON HIM. OUR GEORGE SOLIS IS THERE FOR US. >> Reporter: TONIGHT, THE SEARCH TO FIND DANELO CAVALCANTE INTENSIFYING WITH THE NEW THREAT TO POLICE AND THE COMMUNITY. THE ESCAPED KILLER NOW HAS A GUN. >> HE IS NOW ARMED WITH A .22 CALIBER RIFLE WITH A SCOPE AND FLASHLIGHT MOUNTED ON IT. >> NEARBY SCHOOLS CLOSED. ALERT SENT TO RESIDENTS. >> RESIDENTS IN THE AREA ARE ASKED TO CONTINUE TO SECURE THEIR HOMES AND VEHICLES AND REMAIN VIGILANT. >> Reporter: POLICE SAY LAST NIGHT, CAVALCANTE, WHO HAS KILLED BEFORE, STOLE A RIFLE AND AMMO FROM INSIDE AN OPEN GARAGE, BUT HE WAS CAUGHT BY THE HOMEOWNER WHO DREW HIS OWN GUN AND FIRED AT THE FUGITIVE. >> WE'D HAVE NO REASON TO BELIEVE THAT HE IS INJURED AS A RESULT OF THAT SHOOTING. >> Reporter: AUTHORITIES RACED TO THE SCENE IN MINUTES, BUT DID NOT FIND CAVALCANTE, WHO MAY NOW BE SHIRTLESS, AFTER OFFICIALS SAY THEY RECOVERED THE GREEN SWEATSHIRT HE WAS SEEN WEARING. AUTHORITIES HAVE SET UP A NEW PERIMETER WHERE 500 OFFICERS ARE NOW SCOURING THE WOODED AREA, LOOKING FOR ANY CLUES. >> IT'S SCARY, BECAUSE HE COULD BE ANYWHERE. >> Reporter: DR. MATT BOWERS IS VISITING HIS PARENTS WHO LIVE IN THE NEIGHBORHOOD WHERE THE SHOTS WERE FIRED. THE FAMILY IMMEDIATELY TAKING PRECAUTION. WHAT CAME NEXT WAS A HEAVY POLICE PRESENCE. >> THE ADRENALINE STARTS GOING. AND WE ARE HARD-WIRED AND KIND OF RUNNING THROUGH THE HOUSE, MAKE SURE EVERYTHING IS LOCKED, MAKE SURE ALL THE WINDOWS ARE SECURE. >> Reporter: MEANWHILE, AUTHORITIES SAY THEY ARE CLOSING IN. >> I BELIEVE HE IS BEYOND ASSISTANCE, AND HE IS IN THAT PERIMETER, AND WE WILL ACTIVELY HUNT UNTIL WE FIND HIM. >> Reporter: AUTHORITIES SAY CAVALCANTE DITCHED HIS PRISON SHOES IN THESE NEARBY WOODS AND MAY HAVE STOLEN A PAIR OF WORK BOOTS FROM A NEARBY PORCH. LESTER? >> ALL RIGHT, GEORGE SOLIS, THANK YOU. WE'LL HAVE MUCH MORE FROM HERE IN IRAN LATER. >>> AND IN 60 SECONDS, THE CATASTROPHIC FLOODS IN NEW ENGLAND, AND THE NEW THREAT ON THE WAY. >>> WE'RE BACK NOW WITH A STATE OF EMERGENCY IN MASSACHUSETTS OVER CATASTROPHIC FLASH FLOODS. IT HAPPENED NORTHWEST OF BOSTON WHERE SLOW-MOVING THUNDERSTORMS BROUGHT 9.5 INCHES OF RAIN WITH FLOODS CREATING SINKHOLES AND DAMAGING HOMES. MORE FLOODING RAIN IS POSSIBLE TOMORROW. >>> IN HEALTH NEWS TODAY, THE CDC DECIDED WHO SHOULD GET UPDATED COVID VACCINE SHOTS, WHICH COULD BE WIDELY AVAILABLE JUST DAYS FROM NOW. MIGUEL ALMAGUER HAS DETAILS. MIGUEL, WHO ARE THEY SAYING SHOULD BE GETTING THESE NEW SHOTS? >> LESTER, THE ROLL-OUT WILL BE BROAD. NOW THAT THE CDC DIRECTOR HAS OFFICIALLY SIGNED OFF, WITHIN A MATTER OF DAYS, NEW COVID VACCINATIONS COULD START ARRIVING AT PHARMACIES NATIONWIDE. TODAY THE CDC RECOMMENDS NEARLY ALL AMERICANS GET VACCINATED. THE ADVISORY PANEL SETTING THE STAGE, SAYING EVERYONE SIX MONTHS AND OLDER SHOULD GET THE UPDATED COVID VACCINE THIS FALL IF YOU HAVEN'T BEEN VACCINE NATED IN THE LAST TWO MONTHS. WHILE THE VACCINE SHOULD PROTECT FROM SEVERE ILLNESS AND HOSPITALIZATION, THE QUESTION TONIGHT, WILL THERE BE AN APPETITE FOR THE NEW SHOT AFTER MOST AMERICANS PASSED ON THE LAST ONE? LESTER? >> ALL RIGHT, MIGUEL, THANK YOU. >>> WE HAVE AN UPDATE ON ANOTHER MEDICAL STORY WE TOLD YOU ABOUT YESTERDAY. TODAY IN AN UNANIMOUS VOTE, AN FDA PANEL SAID THE KEY INGREDIENT IN CERTAIN BRANDS OF COLD MEDICINES LIKE VICK'S AND BENADRYL, KNOWN AS PHENYLEPHRINE IS INEFFECTIVE AND COULD BE REMOVED FROM STORES. MORE EFFECTIVE , NBC NEWS, NEW YORK. >>> WHEN WE COME BACK, WE'LL HAVE MORE FROM ON THE GROUND INSIDE IRAN AND WHAT'S NEXT FOR THE NEW GENERATION HERE. IRAN, AND WHAT'S NEX, NBC NEWS, NEW YORK. >>> WHEN WE COME BACK, WE'LL HAVE MORE FROM ON THE GROUND INSIDE IRAN AND WHAT'S NEXT FOR THE NEW GENERATION HERE. IRAN, AND WHAT'S NEXT >>> FINALLY, FROM HERE IN TEHRAN, A CLOSER LOOK AT LIFE INSIDE IRAN AND THE CHALLENGES OF A NEW GENERATION. FOR AMERICANS AND IRANIANS OF A CERTAIN AGE, IT IS A PLACE THAT STIR DEEP EMOTIONS AND MEMORIES OF AN EVENT THAT DOMINATED THE NEWS FOR OVER 444 DAYS. THE FORMER U.S. EMBASSY IN TEHRAN, SITE OF A 1979 CRISIS HOSTAGE CRISIS. >> STILL HAVE A PLAQUE UP THERE, THE UNITED STATES OF AMERICA EMBASSY. >> Reporter: NOW AN ANTI-AMERICAN THEMED MUSEUM, MEMORIALIZING ANOTHER TIME, BUT EMBODIED A TORTURED RELATIONSHIP BETWEEN THE TWO COUNTRIES THAT STILL EXISTS TODAY, RESTING ON MISTRUST AND SUSPICION. ONE OF THE THINGS THAT STRIKES YOU IN TEHRAN IS HOW YOUNG IT IS. THE CROWDS THAT GATHER AT CAFES ON A SUMMER EVENING WEREN'T AROUND WHEN THE EMBASSY FELL, NOR DO THEY KNOW A LIFE WITHOUT SANCTIONS. THEY ARE IRAN'S FUTURE THAT FIND THEMSELVES BUMPING UP AGAINST THIS COUNTRY'S PAST. >> THE PEOPLE WHO HAVE MORE COMFORTABLE LIFE, JUST A NORMAL LIFE. >> Reporter: WONDERING THEIR PLACE IN THE UNSTABLE WORLD AROUND THEM. >> THAT'S "NIGHTLY NEWS" FOR THIS TUESDAY FROM IRAN. THANK YOU FOR WATCHING, EVERYONE. I'M LESTER HOLT. PLEASE TAKE CARE OF YOURSELF AND EACH OTHER. GOOD NIGHT.