(USA TODAY) -- 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.
The killer was identified Monday as Army veteran Wade Michael Page, 40. The FBI was leading the investigation into the shootings Sunday in Oak Creek, Wis., that left seven people dead, including the gunman, and three wounded.
Federal and local investigators sealed off four blocks in the Milwaukee suburb of Cudahy, surrounded Page's home and evacuated neighbors as they searched for information about Page. The neighborhood is about 6 miles from the Sikh Temple of Wisconsin, scene of the shooting.
"We are looking for anything that can give us anything about motive and about who this man was," Oak Creek Police Chief John Edwards told CNN on Monday. He said police were looking for booby traps at his home.
The Sikh rampage came two weeks after a gunman killed 12 people at movie theater in Aurora, Colo. Police in Aurora said that gunman, James Holmes, had rigged bombs in his home.
Edwards said the FBI will lead the Wisconsin 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 of the FBI's Milwaukee office,said in a written statement Sunday night.
Police in New York and Chicago said they were providing additional security to Sikh temples as a precaution.
"This is something we have been fearing since 9/11, that this kind of incident will take place," said Rajwant Singh, chairman of the Washington-based Sikh Council on Religion and Education. "It was a matter of time because there's so much ignorance and people confuse us (as) being members of Taliban or belonging to (Osama) bin Laden."
An Oak Creek police officer, one of the first to arrive at the temple following reports of gunfire, was shot several times, and a second officer shot and killed the gunman, said Bradley Wentlandt, chief of the nearby Greenfield Police Department, speaking for local police.
"The two Oak Creek officers who responded are clearly heroes in this situation today," Wentlandt said in a telephone interview.
"It stopped a tragic event that could have been a lot worse," Edwards said.
When the first officer was shot several times, Wentlandt said, "A second officer on the scene immediately engaged the suspect and shot and killed him."
Three people, including the officer, were in critical condition at Froedtert Hospital. Chief Medical Officer Lee Biblo said the three victims are all adult men.
Hospital spokeswoman Carolyn Bellin said one of the victims had gunshot wounds to the face and extremities, and another had wounds to his abdomen.
Wendlandt, who was designated by Oak Creek police as their spokesman, said the police officer who was shot was in surgery and doctors "think he's going to recover."
Among those shot was Satwant Kaleka, president of the temple, Wentlandt said. Phone calls to his home went unanswered.
Police received several 911 calls about the shooting at 10:25 a.m. CT. Police found four of the dead inside the temple and three, including the gunman, outside. It was not clear how many others were wounded.
Ven Boba Ri, one of the temple members, told the Milwaukee Journal Sentinel that the shooter was a white male who was "not an insider." Ri called the attack "pretty much a hate crime."
Ri told the newspaper that the shooter walked up and shot a priest who was standing outside, then went inside the temple and began firing.
"Our hearts go out to the victims and their families as we all struggle to comprehend the evil that begets this terrible violence," Wisconsin Gov. Scott Walker said.
President Obama said in a statement that he was "deeply saddened" by the shooting and offered whatever federal support is needed for the investigation.
"At this difficult time, the people of Oak Creek must know that the American people have them in our thoughts and prayers, and our hearts go out to the families and friends of those who were killed and wounded," Obama said. "As we mourn this loss which took place at a house of worship, we are reminded how much our country has been enriched by Sikhs, who are a part of our broader American family."
Sunny Singh, 21, of Milwaukee, said a friend pulled into the temple's parking lot, heard shots and saw two people fall down. The friend then saw the shooter reload his weapons and head to the temple's entrance, Singh said.
In Washington, the Indian Embassy was monitoring the situation and was in touch with the National Security Council over the incident, CNN reported.
A survey of Asian-American religions by the Pew Forum on Religion & Public Life, released in July, found Sikhs are 1% of the nation's 18.2 million Asian Americans.
Sikhism is a religion founded in the 15th century by Guru Nanak Dev in the Punjab region of what is now Pakistan. It is among the largest organized religions in the world, with more than 20 million Sikhs worldwide, most in India. There are more than 120 Sikh temples and places of workship in the United States.
Sikh rights groups have reported a rise in bias attacks since the Sept. 11, 2001, terror attacks. The Washington-based Sikh Coalition has reported more than 700 incidents, which advocates blame on anti-Islamic sentiment. Sikhs don't practice the same religion as Muslims, but their long beards and turbans often cause them to be mistaken for Muslims, advocates say.
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. It is a tenet of their faith that uncut hair represents the perfection of God's creation.
But the turban also attracts violence to individuals and their places of worship. In the wake of the Sept. 11 attacks, four drunk teenagers set fire to the Gobind Sadan, a Sikh house of worship in Hastings, N.Y.