here's abc's kayna whitworth. >> reporter: tonight, investigators desperately searching for a possible serial niuasoaronn ist of some sort that we're still trying to sort out. >> reporter: following a massive kingdom hall fire on friday, investigators releasing this surveillance video from another fire. authorities exploring whether the suspect in that fire, seen here wearing a dark hooded sweatshirt, is connected to the most recent fire. friday's inferno, just the latest in a string of five attacks in the last nine months, involving arson, shots fired and a suspicious device, all aimed at jehovah's witness houses of worship, all in the same county in western washington. >> why is this specific religion being targeted? >> reporter: this man, seen here buying fireplace logs back in july, is now considered a person of interest. david, the atf now taking over this investigation, and they tell us they plan on releasing new video of the alleged suspect and will increase the reward for tips leading to an arrest. david? >> all right, thank you, kayna. >>> and from ohio tonight, the fbi has ma