WASHINGTON – U.S. counterterrorism officials say the search for suspects in the death of the U.S. ambassador and three other Americans in Libya on Sept. 11 is being slowed by uncooperative or less-than-capable local law enforcement in Libya, Egypt and Tunisia.

Authorities there have not yet arrested suspects the U.S. wants to question in connection to the violent attack on U.S. compounds in Benghazi on Sept. 11, say two U.S. officials briefed on a closed House intelligence committee hearing Thursday. They spoke on condition of anonymity because they were not authorized to discuss the briefing publicly.

Egypt has arrested Egyptian Islamic Jihad member Muhammad Jamal Abu Ahmad for possible links to the attack, but officials said that key al-Qaida sympathizers remain free.