ABOUT THE VICTIMS. >> YOU CAN HEAR THE TERRIFYING MOMENTS AS A GUNMAN OPENED FIRE WITH A RIFLE, SETTING OFF THE MASSACRE. POLICE, RUSHING INSIDE, RELEASING BLURRED BODY CAMERA FOOTAGE AS THEY CLEARED THE CHARLES UNIVERSITY BUILDING FLOOR BY FLOOR. AUTHORITIES SAY THAT THE GUNMAN WAS A 24-YEAR-OLD STUDENT AT THE UNIVERSITY AND THAT HE TOOK HIS OWN LIFE. INVESTIGATORS BELIEVE HE ACTED ALONE, KILLING HIS OWN FATHER EARLIER THAT DAY. AMONG THE DEAD, THE HEAD OF MUSIC AND THE CZECH NATIONAL NEWSPAPER SAYS A FIRST-YEAR STUDENT WAS KILLED AS WELL. TONIGHT, THE DIRECTOR SAYS THE ACADEMIC COMMUNITY IS DEEPLY SHAKEN, HOLDING OFF ON TEST. AS THE SUN SETS, THE CROWD AROUND THE MEMORIAL CONTINUES TO GROW. >> I THINK THEY JUST NEED TO BE HERE. WE NEED TO BE TOGETHER. >> NOW, FROM PRAGUE. WE SAW THE GROWING MEMORIAL OUTSIDE THE UNIVERSITY. WHAT HAVE WE HEARD FROM THE COUNTRY'S LEADERSHIP DURING THIS INCREDIBLY TRAGIC TIME? >> THEY HAVE ANNOUNCED A NATIONAL DAY OF MOURNING TOMORROW AND THEY HAVE ASKED PEOPLE NOT TO FOCUS ON THE KILLER AND HIS CRIMES SO AS NOT TO INSPIRE SOMEONE ELSE TO CARRY OUT A SIMILAR CRIME. THEY ARE REVIEWING, BUT THIS IS A COUNTRY THAT IS GRIEVING. IT'S THE HOLIDAYS, THEY SHOULD BE CELEBRATING AND INSTEAD, THEY WILL BE BURYING THEIR DEAD. >> UNDERSTANDABLY SO MANY HAVE QUESTIONS ABOUT THE SHOOTER AND ARE WANTING TO UNDERSTAND WHY HE DID THIS AND HOW TO PREVENT IT DOWN THE ROAD. ONE THING WE ARE LEARNING MORE ABOUT IS THE GUNMAN'S POSSIBLE TIES TO ANOTHER KILLING. WHAT CAN YOU TELL US ABOUT THAT? >> THAT'S RIGHT. POLICE BELIEVE THAT HE WAS CONNECT DID, OR RESPONSIBLE TO THE KILLING LAST WEEK IN A FOREST JUST OUTSIDE PRAGUE, A DOUBLE MURDER WHERE A FATHER AND HIS TWO-MONTH-OLD DAUGHTER WERE KILLED. POLICE HAVE SEARCHED THE GUNMAN'S HOME AND TURNED UP A BALLISTIC EVIDENCE THAT MATCHES EVIDENCE FROM THE CRIME SCENE IN THE F
