Al Qaeda is said to be shifting its tactics after the National Security Agency surveillance leaks.
U.S. intelligence agencies are scrambling to salvage their surveillance of al Qaeda and other terrorist groups. It's an electronic game of cat and mouse that can have deadly consequences if a plot is missed or a terrorist disappears.
Two U.S. intelligence officials, speaking on condition of anonymity, said virtually every terrorist group is changing how it communicates, based on what they're reading in the media.
Rep. Mike Rogers, R-Ala., chairman of the House Intelligence Committee, said there are "changes we can already see being made by the folks who wish to do us harm and our allies harm."
He added that the disclosures could "make it harder to track bad guys trying to harm U.S. citizens and the United States."
The NSA and the Office of the Director for National Intelligence both refused to comment on the situation, but NSA Director Gen. Keith Alexander said the leaks caused "irreversible and significant damage to this nation" that will also hurt U.S. allies.