President Barack Obama on Thursday ordered a redoubling of U.S. counter-terrorism efforts in the face of a “credible but unconfirmed” threat ahead of the 10th anniversary of the September 11, 2001 attacks.

U.S. officials, speaking to Reuters on condition of anonymity, said the threat involved Washington D.C. and New York City, which were targeted in al Qaeda attacks a decade ago this Sunday that killed nearly 3,000 people.

A counter-terrorism official said intelligence pointed to possible car bomb attacks and added the threat information came from Pakistan’s tribal areas. A manhunt was underway for two or three suspects, who one person familiar with the matter said were suspected of having links to al Qaeda.

But U.S. officials used strong caveats when discussing the threat information privately, with a national security official cautioning that experts thought the threat would ultimately not check out.

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