Threatening messages have been posted on the White House Facebook page yesterday.

Messages posted were :

“We’ll come back U.S.A. One day only 11/9/2011,”

“We’ll come to u white house sooooooooooon,”

“We’ll come back 11/9/2011 to kill u all,”

Some of the messages featured a photo of Osama bin Laden, using the date/month formula to reference Sept. 11.

US was on high alert after intelligence collected from overseas indicated a possible threat involving car bombs, as well threats to bridges and tunnels.

“They process it, make an assessment and determine what the next step is,” , says Secret Service spokesman Ed Donovan.