Senior U.S. officials are concerned over recent intelligence indicating that the Pakistani Taliban, which orchestrated the failed Times Square bombing, may have successfully placed another operative inside the United States to launch a second attack, sources tell Fox News. Authorities, however, know very little about the potential operative or any possible plot.

“[We] don’t know who it is and don’t know where it is,” one source said. “We know the guy’s here, but don’t know anything about him.”

Based on the intelligence, authorities believe the Pakistani Taliban, also known as Tehrik-e Taliban Pakistan, would have directed the individual to attempt another Times Square-style operation, but not necessarily in New York City.

A senior intelligence official said the threat stream’s lack of specificity makes it nearly impossible for the counterterrorism community to defend against such an attack. Any possible threat, however, does not seem to be imminent, with a senior counterterrorism official saying he was “unaware” of any “imminent threats” against the U.S. homeland.

As for the subject of the latest intelligence, he could be anywhere in the United States, and officials are not convinced he would necessarily target New York City.

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(Read More: Fox News)