Sheriff: Oregon mall gunman wanted to kill as many as possible CLACKAMAS, Ore., Dec. 12 (UPI) -- The gunman who fired in a mall in suburban Portland, Ore., killing two before killing himself, was trying to slay as many people as possible, officials said. The gunman, whom law enforcement officials declined to identify, swept through the Clackamas Town Center Tuesday afternoon, firing away as he moved to the food court and other public areas. Two people were killed and a third was seriously injured before the shooter killed himself. Police have identified the gunman but aren't releasing his name, Clackamas County Sheriff Craig Roberts told ABC's "Good Morning America" Wednesday. "We have been able to identify the shooter over this last night," Roberts said. I believe, at least from the information that's been provided to me at this point in time, it really was a killing of total strangers. To my knowledge at this point in time he was really trying, I think, to kill as many people as possible. Witnesses at the mall said a young man raced through the upper level of Macy's to the food court, firing several shots with what is believed to be a black, semi-automatic rifle, ABC News said. More than 10,000 people were at the mall during the day, police said. Roberts said officers were at the scene within minutes of the shooting and four tactical teams swept the 1.4 million-square-foot building for the shooter, who was eventually found dead. "I can confirm the shooter is dead of an apparent self-inflicted gunshot wound," Clackamas County Sheriff's Department Lt. James Rhodes said Tuesday. By all accounts there were no rounds fired by law enforcement today in the mall. On "Good Morning America," Roberts said the situation could have been worse, noting that the first officer was on the scene 90 seconds after the call was received. "I think we had a lot of, really, what I consider heroes, of citizens stepping up and helping people get out of the facility," Roberts said. There were just some really amazing people who stepped up and I think this really could have been much worse. One witness told ABC News the shooter appeared focused. "He looked like he was on a mission," survivor Vicki Napoli told ABC News. On its website, the mall said it would be closed Wednesday "Our thoughts and prayers are with everyone who was in the mall at the time of this unfortunate incident," a mall statement said. We are grateful to have the stellar support of all the law enforcement agencies and rescue personnel in the area, who immediately took action and continue to ensure the safety of everyone remaining at the property.