A gunman opened fire inside an Illinois manufacturing company Friday, killing at least five civilians and wounding five police officers in the rampage, authorities said. Local police identified the gunman as 45-year-old Gary Martin, who died in a shootout with officers.

Police said they have not yet identified a motive but believe Martin worked at the Henry Pratt manufacturing company. The attack triggered a heavy police response in Aurora, a city of about 200,000 people roughly 40 miles from Chicago.

Fast Facts:

• Police said the shooter, 45-year-old Gary Martin, was killed in a shootout with authorities
• Five officers were struck by gunfire; a sixth officer was being treated Friday for a knee injury
• The shooting happened at a large industrial complex in Aurora, Illinois

Shooter was being terminated from company day of shooting

The shooter was a 15-year employee of the Henry Platt Co. and police believe he was being terminated Friday, Aurora police chief Kristen Ziman said at a press conference late Friday.

Police said it’s unclear if Martin brought his gun to work or went home to retrieve it. All of the people killed were employees of the company, police said.