reporter: nearly a week after that street shootout, authorities now revealing new details about the suspect, mohamad barakat. police say barakat s internet history showed searches for explosive ammo, kill fast and mass shooting events. and even a search for a downtown street fair the night before the shooting. in the days leading up to there, he s looking for specifically to the region for large crowd events in the region. reporter: wallin and two other officers on the scene of a fender-bender on july 14th when police say barakat opened fire from inside this car. its back windows spray painted black. barakat allegedly armed with a long rifle and handgun. police say barakat exited the car, still firing. wallin, an army national guardsman, just sworn in about three months ago, fatally struck. two officers and a civilian wounded before barakat was shot dead by a fourth officer. inside barakat s car, authorities say they found this massive arsenal, including a homemade grenade,