The crime spree spanned across a wide swath of Southern California, prompting several police agencies, including the FBI and US Marshall Service, to form a joint investigative task force.

WSJ: L.A. Authorities Announce $1 Million Reward for Ex-Officer Christopher Dorner

An employee of the Defense Department's Criminal Investigative Services, assigned to the Joint Terrorism Task Force, ultimately decided to drop the investigation after reviewing the intercepted communications and Hasan's personnel files.

CNN: STORY HIGHLIGHTS

An employee of the Defense Department's Criminal Investigative Services, assigned to the Joint Terrorism Task Force, ultimately made the decision to drop the investigation after reviewing the intercepted communications and Hasan's personnel files.

CNN: STORY HIGHLIGHTS