Federal authorities are warning local law enforcement agencies of a potential terrorist threat involving car bombs that could coincide with the 10th anniversary of the Sept. 11 attacks, several sources told Fox News on Thursday.

The Department of Homeland Security confirmed that it had information about a “specific, credible but unconfirmed threat,” and the White House said President Obama was briefed Thursday morning and has been updated throughout the day.

Details trickled in throughout the evening. The potential threat is said to focus on New York City or Washington, D.C., and involves possible suspects tied to Al Qaeda, sources said. Authorities have received a “general description” of two or three possible suspects but don’t necessarily have names, one source said. Authorities are trying to determine if such suspects might already be in the U.S.

One U.S. official said that the intelligence on the potential 9/11 anniversary threat came from tribal areas of Pakistan. The person who provided the intelligence is known to the U.S. intelligence community and “has a track record,” as one source put it.

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