Uncorroborated threat to Wall Street

WASHINGTON (CNN) -- A homeland security official tells CNN a joint FBI/Department of Homeland Security bulletin went out Wednesday to state and local partners warning of an uncorroborated threat to Wall Street - but the official emphasizes there is no credible threat to the homeland at this time.

The official describes the bulletin as being only three lines long, and says it relays "fragmentary" and "uncorroborated" information indicating that Al Qaeda is allegedly interested in hitting what was described as the "international stock exchange," in other words Wall Street, possibly during March.

There was no further information about timing, method, or perpetrators.

Commissioner Paul Browne, an NYPD spokesman, confirmed the bulletin - and stressed this is an uncorroborated threat. He says it originated overseas.

The NYPD notified Wall Street and the network of security people in the financial district. NYPD adjusted its security posture "somewhat," but not "significantly," out of an abundance of caution, Browne said.

He notes that the area already has heavy security.

An FBI official says law enforcement partners in New York were notified out of an abundance of caution since Wall Street is a high interest target - but also said there is no corroboration at this time.