observation for three days at a mental health treatment facility. tom. >> stephanie, thank you. we turn now to the massacre in illinois. police releasing this image of the alleged gunman gary martin. they say he brought his weapon to the meeting at the aurora office, opening fire at the meeting, killing five coworkers and injuring five others. and police saying tonight, he wasn't supposed to be in possession of a firearm, that a background check failed. what we're learning now about the victims, the intern on his first day of work at that plant. abc's zachary kiesch is on the scene. >> reporter: an illinois community is in anguish tonight as we're learning new details about this senseless workplace shooting that left five dead plus the gunman. police say it all began around 1:30, friday afternoon. >> aurora has an active shooter situation. one officer is reported down at this time, active shots being fired. >> reporter: when 45-year-old gary martin, a longtime employee, was called into a meeting to be fired by hr.