WASHINGTON (Reuters) - U.S. Republican presidential hopeful Marco Rubio said his staff was safe after his Washington campaign headquarters was evacuated over a suspicious white powder. “Glad campaign staff in DC is all safe! Thanks to DC emergency personnel,” Rubio said in a tweet. Campaign spokesman Alex Conant told the Washington Post that the substance, which was found by a worker in an envelope at around 4 p.m., turned out to be laundry detergent. Rubio was campaigning on Tuesday in his home state of Florida, one of five states holding primaries for the Republican party. A suspicious substance found at the Houston campaign headquarters of U.S. Republican presidential contender Senator Ted Cruz last week was determined to be non-toxic, a local media report said, citing a Cruz campaign official. 
All clear at Rubio campaign office after white powder scare