THEN IT'S GOING TO GET COOL FOR THE WEEKEND. THOSE DETAILS COMING UP. ALL RIGHT. THANKS, EMILY. FOUR PEOPLE WERE SHOT AND KILLED THIS MORNING ON A BLUE LINE TRAIN IN WEST SUBURBAN FOREST PARK. NATE ROGERS IS LIVE WITH NEW DETAILS. NATE ABSOLUTELY. TERRENCE AND SYLVIA. MORE THAN TEN HOURS AFTER THIS SHOOTING, POLICE REMAIN ON THE SCENE. DETECTIVES HERE, AS WELL AS THE STATION, HAS BEEN OUT OF SERVICE ALL DAY. WE'RE ALSO STILL WORKING TO LEARN THE IDENTITIES OF THE FOUR VICTIMS. WE HAVE HEARD FROM SOURCES THAT IT APPEARS TO BE THREE MEN AND ONE WOMAN, BUT THEIR EXACT AGES AND NAMES, WE HAVEN'T LEARNED JUST YET. BUT POLICE DO SAY THEY HAVE A SUSPECT IN CUSTODY. NOW, DURING A PRESS BRIEFING EARLIER, FOREST PARK'S MAYOR SAID THERE ARE A NUMBER OF RESPONSES HERE HAVE INCREASED QUOTE, EXPONENTIALLY. THE SHOOTING HAPPENED AROUND 5:30 A.M. AUTHORITIES SAY FOUR PEOPLE WERE SHOT ON A BLUE LINE TRAIN AS IT WAS PULLING IN HERE AT THE DES PLAINES FOREST PARK TRANSIT CENTER. THREE VICTIMS WERE IN FACT DEAD AT THE SCENE. THE FOURTH, OFFICIALS SAY, DIED AT THE HOSPITAL. NOW, POLICE SAY THE SUSPECT IMMEDIATELY FLED TO A PINK LINE TRAIN. BUT WITH THE CITY'S ADVANCED SURVEILLANCE TECHNOLOGY AS WELL AS SEVERAL AGENCIES WORKING TOGETHER, INCLUDING FOREST PARK POLICE, CPD, CTA AND THE WEST SUBURBAN MAJOR CRIMES TASK FORCE. LISTEN TO THIS, GUYS. A SUSPECT WAS CAUGHT IN LESS THAN AN HOUR AND A HALF. POLICE SAYING THIS WAS AN ISOLATED INCIDENT AND THERE IS NO THREAT TO THE PUBLIC. OBVIOUSLY IS SHOCKING. YOU KNOW, IT IS UNCOMMON, YOU KNOW, TO HAVE A MASS SHOOTING LIKE THIS, ESPECIALLY THIS CLOSE TO HOME. YOU KNOW, THAT WE'RE ACTUALLY ACTIVELY INVESTING ON, YOU KNOW, ON A HOLIDAY. SO, YOU KNOW, FOR PEOPLE TO FEEL UNSAFE, YOU KNOW, IT'S JUSTIFIED, YOU KNOW, BUT IF ANYBODY DOES SEE ANYTHING IN TERMS OF THAT DOESN'T SEEM RIGHT. YOU KNOW, WE ALWAYS ENCOURAGE PEOPLE TO CALL 911. AND AUTHORITIES AT THAT PRESS BRIEFING ALSO TOLD US THAT A WEAPON WAS RECOVERED. THE MAYOR ALSO SAYING THAT THEY'RE RESPONDING TO THE STATION A LOT BECAUSE OF OVERDOSES. AND OTHER CRIMINAL ACTIVITY. THE MAYOR HERE IN FOREST PARK ASKING FOR MORE HELP. WE DO KNOW AGAIN THAT THE VICTIMS WERE ALL PASSENGERS ON THIS TRAIN. WE DON'T KNOW IF THEY KNOW THEIR KILLER, BUT WE HAVE AND WE ALSO HAVEN'T LEARNED A MOTIVE OR ANY TYPE OF ARGUMENT THAT LED UP TO