Agents. Double agents! Redoubled agents!! Triple Agents!!! (wiki the terms. crazy. mind boggling.)
"... [Humam Khalil Abu-Mulal al-]Balawi was a double agent, posing as a Jordanian informant but working for the al-Qaida terror network.
On December 30, he was invited for a meeting inside a U.S facility in the Afghan border province of Khost. Instead, Balawi blew himself up at the meeting, killing seven agents of the Central Intelligence Agency (CIA) and a Jordanian intelligence officer..."
(Source: Voice of America News)
For further info...
Bomber's Pre-attack English Video Message
CIA base bomber's message (Al Jazeera English)
The many faces of the double agent CIA bomber (Al Jazeera English)
... or, if you prefer, search 'cia bomber' on Google News or Youtube.