Robert Mueller, director of the Federal Bureau of Investigation, spoke last month at a Senate hearing.

VOA: special.2009.10.17

FBI Director Robert Mueller said the drug cartel has transformed itself into what he called a sophisticated criminal organization.

VOA: standard.2009.10.22

Leahy said he was informed immediately about the discovery by FBI Director Robert Mueller.

CNN: FBI releases photo of Leahy anthrax letter

On Monday, FBI Director Robert Mueller insisted the agency had "no warning signs" of last week's attacks.

CNN: U.S. warned in 1995 of plot to hijack planes, attack buildings

The FBI investigated, but found no evidence of extremist activity, FBI Director Robert Mueller told a Senate committee.

CNN: SHARE THIS