Oak Creek, Wisconsin (CNN) -- The gunman who shot six people to death and wounded three others during a rampage at a Sikh temple in a Milwaukee suburb was an Army veteran who may have been a white supremacist, according to a law enforcement source involved in the investigation.
The name of the shooter, who himself was killed by police after wounding an officer, may be released as early as Monday morning, the source added.
Earlier, the FBI had said it had not determined a motive for the Sunday morning shooting and that investigators were looking into whether the attack might be classified as domestic terrorism.
Tom Ahern, a spokesman for the Bureau of Alcohol, Tobacco, Firearms and Explosives, said the gunman had a military background but would not elaborate. He also would not elaborate on the man's tattoos.
Kanwardeep Singh Kaleka, a member of the five-year-old temple in Oak Creek, Wisconsin, said those inside the gurdwara -- or Sikh house of worship -- described the attacker as a bald, white man, dressed in a white T-shirt and black pants and with a 9/11 tattoo on one arm -- which "implies to me that there's some level of hate crime there."
Because of their customary beards and turbans, Sikh men are often confused for Muslims, and have been the targets of hate crimes since the September 11, 2001, attacks on New York and Washington.
While officials try to piece together what prompted the man to go on his shooting spree shortly before the main Sunday morning service, America's Sikh community struggled to come to grips Monday with the brutal attack.
"It's probably somebody not in their right mind," Justice Singh Khalsa, a temple member since the 1990s, said late Sunday. "It's possibly a hate crime, somebody not understanding the religion."
The victims ranged in age from their late 20s to about 70, said Khalsa, who helped translate witness accounts for authorities.
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