ANNOUNCEMENTS OF CHARGES, THERE'S STILL A LOT OF QUESTIONS HERE THAT WE'RE HOPING TO GET ANSWERED AT A PRESS CONFERENCE LATER TONIGHT. BUT THIS AFTERNOON I WAS ABLE TO SPEAK TO THE FOREST PARK MAYOR, WHO TELLS ME THAT HE WANTS TO PUT THE PUBLIC AT EASE AND THAT IN PART MEANS MORE COMMITMENT TO SUPPORT AND RESOURCES TO THIS VERY TRAIN STATION. >> WE CONSIDER OUR COMMUNITY A SAFE COMMUNITY, AND WE DON'T WANT PEOPLE TO FEEL LIKE THEY CAN'T RIDE THE CTA TRAINS. >> FOREST PARK MAYOR RORIE HOSKINS SAYS HE HOPES THE FOUR COUNTS OF MURDER CHARGES AGAINST 30 YEAR OLD SUSPECT RON DAVIS HELPS BRING CLOSURE TO A DEVASTATED COMMUNITY. >> WE WANT TO WORK CLOSELY WITH THE CTA AND MAYBE THEY CAN ENGAGE IN SOME KIND OF, YOU KNOW, SECURITY UPGRADES TO HOPEFULLY SEE THAT THIS DOESN'T HAPPEN AGAIN OR ANYTIME SOON. POLICE SAY LABOR DAY MORNING, DAVIS WORE A MASK WHEN WALKING INTO ONE TRAIN CAR, SHOOTING AND KILLING THREE PEOPLE AND THEN WALKING INTO ANOTHER TRAIN CAR SHOOTING A FOURTH VICTIM. >> INVESTIGATORS SAY THE FOUR VICTIMS, ALL ADULTS, WERE SLEEPING WHEN THEY WERE MURDERED. >> EVERY LOSS OF LIFE IS TRAGIC, REGARDLESS OF WHAT THEIR CIRCUMSTANCE CASES WERE. YOU KNOW, THEY WERE SPECIAL TO SOMEBODY. >> WHILE VILLAGE LEADERS WILL NOT SAY AT THIS TIME IF THE PEOPLE INVOLVED IN THE SHOOTING WERE UNHOUSED. STATE LEADERS SAY MORE COULD HAVE BEEN DONE TO PREVENT THIS MASS SHOOTING. THE WEST SIDE HEROIN TASK FORCE, THEY CONSTANTLY REPORT THE NEED FOR HOUSING. >> THEY CONSTANTLY REPORT THE NEED FOR MENTAL AND BEHAVIORAL HEALTH SUPPORT FOR PEOPLE. THE TRAGIC TO ME, LOOK, THE GUNS IN THIS COUNTRY ARE OUT OF CONTROL AND THE ACCESS THAT PEOPLE HAVE TO GUNS, IT'S OUT OF CONTROL AND IT'S VERY SICKENING. >> POLICE SAY THEY WERE ABLE TO IDENTIFY DAVIS USING THE CTA'S VIDEO SURVEILLANCE SYSTEM. THEY THEN ARRESTED DAVIS NEARLY 90 MINUTES LATER AT A PINK LINE STATION ON CALIFORNIA, AND RECOVERED A FIREARM. THE SHOOTING HAS LEFT EVERY DAY COMMUTERS FEELING UNEASY. PEOPLE DO NOT FEEL SAFE OUT HERE, AND THAT'S I MEAN, JUST IN COMMUNITIES, PERIOD. >> NOW THAT PRESS CONFERENCE IS SCHEDULED FOR TONIGHT AT 7 P.M. >> WE EXPECT TO HEAR FROM BOTH THE FOREST PARK POLICE DEPARTMENT AS WELL AS THE STATE ATTORNEY'S OFFICE. BUT AGAIN, LOTS OF UNANSWERED QUESTIONS HERE, INCLUDING WHAT WAS THE MOTIVE THAT LED TO THIS SHOOTING ? OF COURSE, YOU CAN HEAR THAT ENTIRE PRESS CONFERENCE TONIGHT AT SEVEN ON OUR WEBSITE AT ABC