Disregard my previous post. I found the type of handgun that the hero police officer used to take down the terrorists.
"Harn said Simpson and Soofi were armed with “assault rifles” and wearing body armor, yet the officer was able to take them out.
“Four SWAT team members with high-powered rifles also fired at the suspects,” but CNN reports that both were killed by the traffic cop armed with a .45 caliber Glock."