“It’s a catastrophic intelligence loss”

"... Among the more than two dozen American personnel evacuated from the city after the assault on the American mission and a nearby annex were about a dozen C.I.A. operatives and contractors, who played a crucial role in conducting surveillance and collecting information on an array of armed militant groups in and around the city.“It’s a catastrophic intelligence loss,” said one American official who has served in Libya and who spoke on the condition of anonymity because the F.B.I. is still investigating the attack. “We got our eyes poked out.”
The C.I.A.’s surveillance targets in Benghazi and eastern Libya include Ansar al-Sharia, a militia that some have blamed for the attack, as well as suspected members of Al Qaeda’s affiliate in North Africa, known as Al Qaeda in the Islamic Maghreb.
Eastern Libya is also being buffeted by strong crosscurrents that intelligence operatives are trying to monitor closely. The makeup of militias varies widely; some are moderate, while others are ultraconservative Islamists known as Salafis.... 
American intelligence operatives also assisted State Department contractors and Libyan officials in tracking shoulder-fired missiles taken from the former arsenals of the former Libyan Col. Muammar el-Qaddafi’s forces; they aided in efforts to secure Libya’s chemical weapons stockpiles; and they helped train Libya’s new intelligence service, officials said.
Senior American officials acknowledged the intelligence setback, but insisted that information was still being collected using a variety of informants on the ground, systems that intercept electronic communications like cellphone conversations and satellite imagery. “The U.S. isn’t close to being blind in Benghazi and eastern Libya,” said an American official...."