Authorities were trying to determine a motive Monday for a bloody attack on a Sikh temple outside Milwaukee while Sikhs across the U.S. struggled with new worries about their safety.

An official identified the shooter as Wade Michael Page, 40, a former Army soldier who was reduced in rank before his discharge. The FBI was leading the investigation into the shootings Sunday in Oak Creek, that left seven people dead, including the gunman, and three wounded.

The official, who spoke to the Associated Press on condition of anonymity because he was not authorized to release information yet about the suspect, said Page entered the Army in 1992 and was discharged in 1998. He said the man was reduced in rank from sergeant to specialist, but he gave no reason.

The Southern Poverty Law Center, a group that has studied hate crimes for decades, told the Milwaukee Journal Sentinel that Page was a frustrated neo-Nazi who had been the leader of a racist white-power band known as End Apathy.

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