ST. LOUIS (KMOX) - Students are back in class today at the Stevens Institute of Business and Arts on Washington Avenue, one week after last Tuesday’s shooting.

Sean Johnson, 34, of the 5300 block of Cote Brilliante in St. Louis, had been an on-again, off-again student at the school for the past four years before police say he shot financial official Greg Elsenrath before turning the gun on himself. Both men survived.

Police Chief Sam Dotson says the city’s police department has been talking to colleges and K-12 schools about beefing up security.

“We need single-point entry, we need security plans, we need shelter training, evacuation training,” he said. “Those are the sort of things we’re going to provide.”

It was confirmed yesterday that the semi-automatic pistol allegedly used by Johnson had been stolen from someone who legally purchased it. The serial number on the gun had been filed off.

“I’ve said repeatedly,” Dotson told KMOX, “it’s not the legal guns in the hands of legal people, it’s the illegal guns in the hand of criminals that are the problem.”

Stevens president Cynthia Musterman sent a letter to Chief Dotson, inviting him to coffee today as a thank you, and Dotson said he was “very proud of the way the officers responded” Tuesday, noting their quick response time. He said the response was smooth because the department has studied local incidents, like the 2010 shooting at the ABB plant, as well as nationally-known mass shootings.