CBS New York reports six people, including a police officer, were being monitored Thursday night after a suspicious white powder was found at Trump Tower in New York City. The FDNY told CBS New York the white powder was found in the mailroom at Trump Tower, located at 725 Fifth Ave. in Midtown Manhattan, around 8 p.m. Five civilians and a police officer were being isolated and monitored. The incident was under investigation by the FDNY and the NYPD Thursday evening.