White House locked down after smoke bomb tossed

WASHINGTON,  (Reuters) – The White House was  locked down on Tuesday night as authorities  investigated what appeared to be a smoke bomb that was tossed  over the fence of the White House compound, a Secret Service  spokesman said.
The device was tossed over the fence at one point when about   1,000 to 1,500 “Occupy DC” protesters were demonstrating  outside the White House, Secret Service spokesman George Ogilvie  said.

He said authorities were taking “appropriate measures to  clear it.” He also said that a majority of the protesters had  left the area and that there had been no arrests.

President Barack Obama and wife Michelle had gone out to  dinner and were not at the White House when the device was  thrown over the fence but returned while the investigation was  underway.

Members of the White House press pool were prevented from  leaving the grounds.