New York City authorities investigate report of white powder at Trump Tower

Police officers stand outside the Trump Tower during an investigation into a suspicious white powder substance found inside the tower, according to fire fighters at the scene, in the Manhattan borough of New York, U.S., April 28, 2016. REUTERS/Carlo Allegri

(Reuters) - New York City firefighters and police said on Thursday they were investigating a report that a suspicious white powder substance was found inside Trump Tower in Midtown Manhattan.

New York Police spokesman Brendan Ryan said the powder was found in an office on the fifth floor of the building, which houses the campaign headquarters of Donald Trump, the Republican presidential front-runner. No injuries were reported and an investigation was underway, he said.