>>> THIS IS AN NBC NEWS SPECIAL REPORT. HERE'S LESTER HOLT. >> GOOD AFTERNOON. WE'RE COMING ON THE AIR WITH BREAKING NEWS. THERE HAS BEEN A SHOOTING AT THE PARADE CELEBRATING THE SUPER BOWL CHAMPIONSHIP KANSAS CITY CHIEFS. WE ARE GETTING REPORTS THAT MULTIPLE PEOPLE HAVE BEEN SHOT. IT IS STILL CLEARLY AN ACTIVE SITUATION. THERE IS A LARGE POLICE PRESENCE THERE RIGHT NOW. LET'S GO RIGHT TO JESSIE KIRSCH, WHO IS IN KANSAS CITY. WHAT HAVE YOU SEEN AND HEARD? >> Reporter: YEAH, LESTER. SO POLICE ARE TELLING US THAT SHOTS HAVE BEEN FIRED AROUND UNION STATION BEHIND ME HERE. THIS IS WHERE THE CELEBRATION WAS JUST WRAPPING UP FOR THE KANSAS CITY CHIEFS. I'LL HAVE OUR PHOTOGRAPHER PAN OVER TO THE SIDE. THERE IS STILL AN AMBULANCE WITH THE LIGHTS FLASHING. OUR TEAM WAS ABLE TO SEE AT LEAST ONE PERSON ON A STRETCHER FROM OUR VANTAGE POINT, WHICH IS QUITE A WAYS BACK. YOU CAN SEE THERE'S STILL PEOPLE MILLING ABOUT OUT HERE IN RED CHIEFS GEAR, EVEN THOUGH THE CROWD HAS BEEN ASKED TO GO HOME. SO IT JUST SPEAKS TO THE FACT THAT THE BROADER PUBLIC MAY NOT REALIZE WHAT HAS UNFOLDED HERE. WE'LL PAN OVER TO THE OTHER SIDE OF THE TRAIN STATION WHERE WE SAW SIMULTANEOUSLY FANS IN RED GEAR RUNNING AWAY FROM THE TRAIN STATION. AT THE SAME TIME, WHAT APPEARED TO BE A GROUP OF POLICE OFFICERS RUSHING INTO THE AREA, SOME EVEN JUMPING OVER THE FENCE. AGAIN, ALL THESE BARRICADES ARE UP BECAUSE OF THIS PARADE. WE HAVE ALSO HAD OUT HERE, BECAUSE OF THE SIZE OF THE CROWD, A HEIGHTENED SECURITY PRESENCE. THERE'S A TEAM WITH BINOCULARS UP HERE. AND YOU CAN SEE ON TOP OF THAT HOTEL OVER THERE, THERE'S A TEAM WITH A LONG GUN ON A TRIPOD. WHAT WE NOTICED IS ALL THAT WAS UNFOLDING ON THE GROUND, ONE OF THE TWO PEOPLE UP THERE RAN AWAY FROM THE CORNER, SEEMED TO BE GRABBING SOMETHING AND BRINGING IT BACK TO THE FRONT. SO WE NOTICED THIS HEIGHTENED SECURITY PRESENCE. YOU CAN HEAR THE SIRENS IN THE BACKGROUND. THAT'S BEEN GOING ON FOR THE LAST HALF HOUR OR SO AS THIS HAS BEEN UNTOLDING. AGAIN, WHAT YOU ARE LOOKING AT IS THE AFTERMATH OF THE CELEBRATION FOR THE BACK-TO-BACK SUPER BOWL CHAMPS. OFFICIALS HAD EXPECTED BECAUSE OF THE WEATHER AMONG OTHER FACTORS THAT THERE COULD BE AROUND A MILLION PEOPLE OUT HERE IN THE DOWNTOWN TODAY ALONG THE PARADE ROUTE AND AROUND HERE FOR THE RALLY. CERTAINLY NOT ALL OF THEM OVER HERE. BUT THERE WERE EASILY THOUSANDS OF PEOPLE, IF NOT TENS OF THOUSANDS OF PEOPLE IN THIS IMMEDIATE VICINITY WHEN THIS INCIDENT APPEARS TO HAVE UNFOLDED. AGAIN, POTENTIALLY AROUND A MILLION PEOPLE. AT THIS POINT, IT IS MOSTLY CALM OUT HERE. BUT CERTAINLY YOU CAN SEE THAT THESE TEAMS THAT HAVE BEEN ON THE ROOF TOPS ARE KEEPING A CLOSE EYE ON WHAT IS EVOLVING AROUND THAT TRAIN STATION. >> WE HAVE SEEN SOME OF THE VIDEO THAT'S COME IN TO US. WE SAW A WOMAN ON A STRETCHER. WE DON'T KNOW HER CONDITION OR WHAT SHE EXPERIENCED. BUT BEING TAKEN OBVIOUSLY TO AN AMBULANCE. WE ALSO ARE HEARING REPORTS FROM POLICE THAT TWO ARMED INDIVIDUALS WERE DETAINED. DO WE KNOW ANYTHING MORE ABOUT THAT? >> Reporter: SO I CAN TELL YOU FROM WHERE WE ARE, WE DID NOT SEE ANYONE BEING ARRESTED. FROM ALL THE WAY BACK HERE. AND AT THIS POINT, LESTER, IT IS QUITE COMMON WE'RE NOT SEEING ANYONE BEING MOVED AROUND IN HAND CUFFS. WE HAVE BEEN ABLE TO SEE THAT ONE PERSON ON A STRETCHER SO FAR FROM THIS VANTAGE POINT. AGAIN, THERE ARE JUST STILL MANY PEOPLE OUT HERE WHO ARE WALKING AROUND. YOU CAN SEE OFF IN THE DISTANCE, PEOPLE ALL THE WAY OVER THERE, PEOPLE ON A BRIDGE CONTINUING TO STREAM OUT OF SHEER, AS YOU WOULD SEE AFTER ANY MAJOR SPORTING EVENT, LET ALONE A PARADE OF THIS SIZE. IT GIVES YOU AN IDEA, LESTER, HOW MANY PEOPLE ARE STILL IN THIS AREA, AND IF THEY WERE IN A POSITION WHERE THEY HAD TO BE RUNNING, IT WOULD HAVE BEEN QUITE DIFFICULT FOR THEM TO MAKE IT AWAY FROM THIS AREA IN A QUICK TIMELINE. >> PUT THIS IN SOME TIME PERSPECTIVE FOR US. DID THIS OCCUR AT THE END OF THE PARADE AND WHERE WAS THE PARADE IN RELATION TO THE SHOT YOU WERE ABLE TO SHOW US? >> Reporter: YEAH. SO THE FESTIVITIES HAD BEEN GOING ON FOR A COUPLE OF HOURS. OFF IN THE DISTANCE BACK THERE, INTO THE SKYLINE, THAT'S WHERE THE PARADE BEGAN AROUND 11:00 A.M. LOCAL TIME, ABOUT NOON EASTERN. IT WAS ABOUT A TWO-MILE ROUTE THAT WENT DOWN THAT WAY AND BROUGHT THE TEAM OVER HERE AND THEY RALLIED ON THE STAGE FOR ABOUT HOUR. I WOULD SAY ABOUT A QUARTER BEFORE 4:00 EASTERN. THAT'S WHEN WE SAW THE RALLY WRAPPING UP, AND PEOPLE STARTED DISBURSING. WITHIN MINUTES OF THE TYPICAL BREAKUP OF AN EVENT LIKE THAT, WE NOTICED THERE WERE PEOPLE WHO WERE RUNNING AWAY FROM THE AREA OFF IN THAT CORNER. THAT'S AROUND THE SAME TIME, LESTER. SO IT'S ABOUT 45 MINUTES OR SO, WITHIN THE LAST 40 MINUTES THAT WE SAW PEOPLE RUNNING AWAY. IT WOULD APPEAR TO BE A SECURITY OR POLICE PERSONNEL RUSHING IN, AND THE TEAMS ON THE ROOF TOPS SUDDENLY BECAME IN A POSTURE THAT, YOU KNOW, GAVE US THE SENSE THAT SOMETHING MORE SERIOUS WAS GOING ON. >> THIS ALL OCCURRING AT A CELEBRATION FOR THE CHIEFS OVER THEIR SUPER BOWL WIN. DO WE KNOW, WAS THE TEAM, WAS THERE A BUS ANYWHERE IN SIGHT OF WHERE THE ACTIVITY WAS OCCURRING? >> Reporter: SO THERE WERE MULTIPLE BUSES INVOLVED WITH THIS PARADE. WHAT LOOKED LIKE WAS GOING ON THEY WERE DROPPING OFF THE TEAM WHEN THEY WENT ON STAGE. UNION STATION IS A MASSIVE SPACE. THERE'S CERTAINLY PLENTY OF SPACE WITHIN THERE, WHERE THE PEOPLE COULD HAVE BEEN HOLDING, TRYING TO GET OUT IN THE AFTERMATH OF THE PARADE. BUT IT APPEARED FROM WHAT WE COULD SELL THAT THE PEOPLE WAS NOT ON STAGE AT THE TIME THAT THIS HAPPENED. AGAIN, LESTER, IT WAS GOING ON AS THE RALLY HAD WRAPPED UP AND PEOPLE WERE IN LARGER NUMBERS MOVING AWAY. SO CLEARLY THE CROWD MORE BROADLY FELT THE EVENT WRAPPED UP AT THAT POINT AND MOVING AWAY. BUT THE BROADER TRICKLE OUT OF FANS DID NOT CHANGE, EVEN AFTER WE STARTED TO SEE THAT UP-CLOSE POLICE ACTIVITY. IT GIVES US THE SENSE THAT PEOPLE ON THE GROUND WOULDN'T HAVE BEEN HEARING GUNSHOTS RINGING OUT. >> I'M GOING TO ASK Y