The FBI says investigators haven't identified anyone other than the gunman as being responsible for the shootings at a Sikh temple in Wisconsin Sunday that left six worshippers dead.

A former girlfriend of Wade Michael Page was arrested on a weapons violations Sunday, but the FBI says the woman has been cooperative and is not connected to the shootings.

FBI Special Agent in Charge Teresa Carlson says the motive behind the shootings remains unknown. She also told reporters today that investigators have determined Page died of a self-inflicted gunshot wound to the head after he was shot by police. Authorities previously said an officer had fired the fatal shot.

Meanwhile, three people injured in the shooting remain hospitalized in critical condition. They include Police Lt. Brian Murphy. He was one of the first responding officers and was shot 8 or 9 times as he was tending to a shooting victim outside the temple.


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