The Southern Poverty Law Center says that Wade Michael Page, the suspected shooter at a Sikh temple in Wisconsin, was a singer in a "skinhead" band called End Apathy. SPLC says this is a photo of the alleged shooter from the band's MySpace page.

The man authorities say killed six in a Milwaukee-area Sikh temple before police shot him was a heavily-tattooed, 40-year-old ex-Army soldier, sources told Fox News, but what triggered his rampage remains unclear.

Sources identified the dead suspect as Wade Michael Page, who was at one time attached to the Fort Bragg Army installation in North Carolina. Local authorities have scheduled a 10 a.m. press conference, where more details may emerge about Page and what the FBI is treating as an act of domestic terrorism in the temple, in the Milwaukee suburb of Oak Creek. Six people were killed and four wounded, including a police officer, before the man being identified as Page was shot dead by a police officer.

Read More: FOX News

At least seven people were killed, including the suspected gunman, in a mass shooting at a Sikh temple in Oak Creek, Wis., south of Milwaukee on Sunday.

According to police, 911 dispatchers received multiple calls from the temple at approximately 10:25 a.m. local time. An officer who responded to the scene was treating a victim when he was "ambushed" by the suspected gunman in the parking lot, Oak Creek Police Chief John Edwards said. The veteran officer was shot multiple times and rushed to Milwaukee's Froedtert Hospital where he underwent surgery, Edwards said.

The suspect was shot and killed by a second officer, police said. The gunman was not identified, and no motive was released. But according to Thomas Ahern, spokesman for the ATF Chicago bureau, the gunman was a white male in his early 40s.

Sources told ABC News the suspect was a "white supremacist" or "skinhead." And officials told NBC News he had "some kind of radical or white supremacist views," but was apparently not a member of any kind of radical organization. His past run-ins with law enforcement were described as minor.

Tactical units conducting a sweep of the 17,000-square-foot temple discovered four bodies inside and three—including the gunman—in the parking lot. Edwards said "weapons" were recovered, but would not elaborate. According to CNN, two semi-automatic handguns were recovered at the scene, and member of the temple described the gunman as tall male with what appeared to be a "9/11 tattoo." Officials told NBC the suspect, who served in the U.S. Army, had many tattoos.

There were initial, unconfirmed reports of multiple shooters and a hostage situation, though police said they believe there was just one gunman.

A spokesman for Froedtert Hospital said a total of three victims, including the officer, were admitted—two with gunshot wounds to the face and one with gunshot wounds to the abdomen. All three are in critical condition, the spokesman said. Other area hospitals were initially told to prepare for as many as 20 victims, though it appears that figure was precautionary.

Law enforcement officials are treating the case as an "act of domestic terrorism," police said, and the FBI is leading the investigation. The names of the victims in Sunday's shooting were not released.

According to the Milwaukee Journal Sentinel, Satwant Kaleka, the president of the temple, was one of the victims taken to Froedtert Hospital, according to his nephew, Gurmit Kaleka.

Dozens of worshipers, including women and children, were gathering for a meal before an 11:30 a.m. prayer service at the temple, or gurdwara, when the shooting occurred. There are about 500 members in the congregation, officials said.

Read More: Yahoo News