OAK CREEK, Wis. (CBSDC/AP) — Authorities tell CBS News that the shooter behind the deadly massacre at the Sikh Temple of Wisconsin Sunday has been identified as 40-year-old Wade Michael Page.

Page previously served in the U.S. military, but was no longer on active duty, sources tell CBS News.

CBS News reports that Page enlisted in the Army in April 1992 and was given a less-than-honorable discharge in October 1998. He was last stationed in Fort Bragg, N.C., serving in the psychological operations unit.

Sunday’s shooting outside the temple in suburban Milwaukee left seven dead, including the suspect, and three others critically wounded in what police called an act of domestic terrorism.

Satpal Kaleka, wife of the temple’s president, Satwant Singh Kaleka, was in the front room and saw the gunman enter the temple, according to Harpreet Singh, their nephew.

“He did not speak, he just began shooting,” said Singh, relaying a description of the attack from Satpal Kaleka.

Kaleka said the 6-foot-tall bald white man — who worshippers said they had never before seen at the temple — seemed like he had a purpose and knew where he was going.

Late Sunday, the investigation appeared to move beyond the temple as police, federal agents and the county sheriff’s bomb squad swarmed a neighborhood in nearby Cudahy, evacuated several homes and searched a duplex. Bureau of Alcohol, Tobacco, Firearms and Explosives agent Tom Ahern said warrants were being served at the gunman’s home.

Oak Creek Police Chief John Edwards said police expected to release more information Monday. He said the FBI will lead the investigation because the shootings are being treated as domestic terrorism, or an attack that originated inside the U.S.

“While the FBI is investigating whether this matter might be an act of domestic terrorism, no motive has been determined at this time,” Teresa Carlson, Special Agent in Charge with the agency’s Milwaukee division, said in a statement Sunday night.

During a chaotic few hours after the first shots were fired around 10:30 a.m., police in tactical gear and carrying assault rifles surrounded the Sikh Temple of Wisconsin with armored vehicles and ambulances. Witnesses struggled with unrealized fears that several shooters were holding women and children hostage inside.

Edwards said the gunman “ambushed” one of the first officers to arrive at the temple as the officer, a 20-year veteran with tactical experience, tended to a victim outside. A second officer then exchanged gunfire with the suspect, who was fatally shot. Police had earlier said the officer who was shot killed the suspected shooter.

The wounded officer was in critical condition along with two other victims Sunday night, authorities said. Police said the officer was expected to survive.

Tactical units went through the temple and found four people dead inside and two outside, in addition to the shooter.

Jatinder Mangat, 38, of Racine, another nephew of the temple’s president, said his uncle was among those shot, but he didn’t know the extent of his injuries. When Mangat later learned people had died, he said “it was like the heart just sat down.”

Gurpreet Kaur, 24, of Oak Creek, said her mother was among a group of about 14 other women preparing a meal in the temple kitchen when the gunman entered and started firing. Kaur said her mother felt two bullets fly by her as the group fled to the pantry. Her mother suffered what Kaur thought was shrapnel wound in her foot.

“These are people I’ve grown up with,” she said. “They’re like aunts and uncles to me. To see our community to go through something like this is numbing.”

Many Sikhs in the U.S. worship on Sundays at a temple, or gurdwara, and a typical service consists of meditation and singing in a prayer room where worshippers remove their shoes and sit on the floor. Worshippers gather afterward for a meal that is open to the entire community.

Kaur said she spent the afternoon serving as a translator between law enforcement and survivors at a nearby bowling alley. Police investigators kept witnesses inside the bowling alley’s basement into the evening.

“We don’t even know who’s downstairs,” Ravi P. Singh, 25, of Greenfield, said after going to the bowling alley to see if he could get more information about what had happened.

Sixteen-year-old LeRon Bridges, of Oak Creek, works at the bowling alley said police brought people from the temple over in two armored trucks. At one point, about 50 to 60 people were at the bowling alley, including police officers questioning witnesses and paramedics treating victims’ wounds, he said.

“They were just hysterical,” Bridges said. “There were kids. One big load came out of the truck.”

Sikhism is a monotheistic faith founded more than 500 years ago in South Asia. It has roughly 27 million followers worldwide. Observant Sikhs do not cut their hair; male followers often cover their heads with turbans — which are considered sacred — and refrain from shaving their beards. There are roughly 500,000 Sikhs in the U.S., according to estimates. The majority worldwide live in India.

The Sikh Temple of Wisconsin started in 1997 with about 25 families who gathered in community halls in Milwaukee. Construction on the current temple in Oak Creek began in 2006, according to the temple’s website.

Sikh rights groups have reported a rise in bias attacks since the Sept. 11, 2001, terrorist attacks. The Washington-based Sikh Coalition has reported more than 700 incidents in the U.S. since 9/11, which advocates blame on anti-Islamic sentiment. Sikhs are not Muslims, but their long beards and turbans often cause them to be mistaken for Muslims, advocates say.

Police in New York and Chicago issued statements saying they were giving Sikh temples in those cities additional attention as a precaution after the shooting, which also came two weeks after a gunman killed 12 people at movie theater in Colorado.

Valarie Kaur, who chronicled violence against Sikh Americans in the 2006 documentary “Divided We Fall,” was returning to her home in New Haven, Conn., after speaking at a White House conference Friday when she heard about the shootings.

Even though the gunman’s motives were a mystery Sunday, Kaur said the shootings reopened wounds in a community whose members have found themselves frequent targets of hate-based attacks since Sept. 11.

“We are experiencing it as a hate crime,” she said. “Every Sikh American today is hurting, grieving and afraid.”

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