Adam Kokesh and libertarian activists expected to provoke a police response when heposted a video of himself apparently loading a shotgun on Freedom Plaza in violation of D.C. law on the Fourth of July, but it arrived on his doorstep with an overwhelming boom Tuesday night.

A U.S. Park Police SWAT team and other officers knocked on the door of his single-family home on a quiet Herndon cul-de-sac, then kicked the door in and tossed a flash grenade into the foyer as police helicopters whirled overhead, his roommates said.