`` It was a pretty rapid pace of fire in that theater , '' the police chief says . More than 6,000 rounds of ammunition was bought through online purchases , he adds . The gunman had been on the run for several days before being arrested by authorities who found him hiding out at his girlfriend's house. Expert : Chad Weinman , CEO of TacticalGear.com of Chesterfield , Missouri , told CNN earlier that his company had a receipt matching Holmes ' name and his Aurora address . Shotgun blast across row of theater seats could kill or wound 15 people .
`` It was a pretty rapid pace of fire in that theater , '' the police chief says . More than 6,000 rounds of ammunition was bought through online purchases , he adds . The gunman had been on the run for several days before being arrested by authorities who found him hiding out at his girlfriend's house. Expert : Shotgun blast across row of theater seats could kill or wound 15 people .