Suspicious Powder in an Envelope Hits Reuters

Last week, the police investigated the NY Times building after a letter with a suspicious white powder (later found to be harmless) was delivered to editorial page editor Andrew Rosenthal. This afternoon, Reuters editor Brian Rhoads opened an envelope and a "puff of powder" came out. Reuters reported that Rhoads was isolated and "140 members of staff [were told] to leave as a precautionary measure while they investigate." Who's next--the AP? Or the Wall Street Journal--or one of the tabloids? Like the NY Times, Reuters is located in Times Square, at 3 Times Square.