september 11th memorial. >> he kept doing all the way down, full speed. and then the next thing, all i heard was, like, nine, ten gunshots. >> bunch of people came running past my way, yelling, he's got a gun, he's got a gun. >> reporter: this cell phone video showing the driver limping after getting out of the truck, its front end completely smashed. he's holding what turned out to be two fake guns. sources telling abc news he shouted "allahu akbar." an officer then shot him in the abdomen. tonight, he is now custody. this tearful mother saying the attacker pointed one of his guns at her daughter. >> she just said, i saw the man with the guns. he pointed the gun at me. i'm sorry. i have to go get my child. >> reporter: hundreds of police immediately swarming the scene, shutting down parts of lower manhattan. a nearby school going into lockdown. chaos and confusion in the streets. at first, reports that it was a road rage incident, but then authorities calling it an act of terror. the nypd already on high alert