US Intelligence warned embassy of threat 48 hrs in advance of attack.

By Suzanne Kelly CNN

Concerned about the reaction to an anti-Muslim film that was gaining attention online, the U.S. intelligence community sent a cable to the embassy in Egypt warning of the concern, a U.S. official told CNN. It was sent 48 hours before the protests in Cairo and Benghazi in Libya, the official said.

The cable did not discuss any specific threat, the official said. It warned instead about the existence of the movie being posted on the internet and the fact that it was gaining attention. A seven minute portion of the movie aired on an Egyptian TV talk show the weekend before the protests started, according to a Department of Homeland Security/Federal Bureau of Intelligence memo obtained by CNN on Thursday.

The cable was not sent to the embassy in Tripoli, Libya or the consulate in Benghazi. US officials have said there was no intelligence ahead of the attack in Benghazi, which intelligence officials still believe was not planned. The White House spokesman Jay Carney said Friday there was no "actionable intelligence" indicating an attack was being planned.

There are hundreds if not thousands of cables sent each day, the official said, and there was no specific threat attached to this one, because a specific threat was not known.

Former Navy Seal among dead in Libya

One of the Americans killed alongside Ambassador Christopher Stevens in an attack on a U.S. diplomatic mission in Libya Tuesday told ABC News before his death that he was working with the State Department on an intelligence mission to round up dangerous weapons in the war-torn nation.

In an interview with ABC News last month, Glen Doherty, a 42-year-old former Navy SEAL who worked as a contractor with the State Department, said he personally went into the field to track down so-called MANPADS, shoulder-fired surface-to-air missiles, and destroy them.

After the fall of dictator Moammar Gadhafi, the State Department launched a mission to round up thousands of MANPADS that may have been looted from military installations across the country. U.S. officials previously told ABC News they were concerned the MANPADS could fall into the hands of terrorists, creating a threat to commercial airliners.