Add Yahoo as a preferred source to see more of our stories on Google. ABC News contributor and former CIA field operator Darrell Blocker discusses what the immediate future of Iran may look like and ...

Since last year, CIA operatives inside Mexico have directly participated in deadly attacks on several, mostly mid-level cartel members, the sources said.

According to sources familiar with the operation, the raid of a clandestine drug lab involved four CIA agents, raising questions about the scope of the agency's activity in Mexico.