Bomb threat prompts White House press room evacuation
English.news.cn

WASHINGTON, June 10 (Xinhua) -- The White House press room was evacuated over a bomb threat after a phone call alerted the Metropolitan Police Department, said White House Spokesman Josh Earnest Tuesday.

The Secret Service interrupted White House spokesman Josh Earnest's televised news briefing shortly after 2 p.m. and escorted journalists out of the building.

While journalists were out of the press room, secret service officers combed the venue looking for explosives with the help of a sniffer dog.

A little more than 30 minutes later, an all-clear signal was given, and journalists were led back to the press room.

Full story: http://news.xinhuanet.com/english/2015-06/10/c_134312116.htm

-- Xinhua 2015-06-10

Maybe a disgruntled Secret Service Agent?