NEW YORK, Sept. 11 (UPI) -- Messages threatening a terrorist attack were posted on the White House Facebook page, a New York television station reported Sunday.
"We'll come back U.S.A. One day only 11/9/2011," said one message, using the day before the month to designate Sept. 11, 2011, WNBC-TV, New York, reported. The message featured a photo of Osama bin Laden.
Another message read, "We'll come to u white house sooooooooooon" while a third said, "We'll come back 11/9/2011 to kill u all,"
The postings have since been removed.
WNBC reported Secret Service spokesman Ed Donovan said the agency has referred the messages to its Internet threat desk.
"They process it, make an assessment and determine what the next step is," Donovan said.
New York and Washington have been under heightened security after overseas intelligence indicated a possible threat involving car bombs along with threats to bridges and tunnels. The intelligence indicated three men would travel from Pakistan to carry out an attack.
U.S. officials have described the threat as "specific" and "credible" but unconfirmed.