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The gunman acted alone, police said, but the reason for the attack remained unclear. Edwards said officers knocked on 200 doors Sunday in an effort to determine that there was not more than one shooter and that everyone in the surrounding neighborhood was safe. He also said officers conducted a 3-square-mile grid search in the area with air support in case more than one person was involved. Although there were reports of more than one shooter, Edwards said Monday investigators are confident there was only one gunman.

Based on what is known about the attack, it is believed to be the most deadly U.S. attack on Sikhs, who often have been mistaken for Muslims and targeted in hate crimes.

According to a witness, the gunman first walked up to a priest who was standing outside, shot him, then entered the temple and began firing.

As the shooting erupted, women, children and men hid in the temple for more than an hour. They took refuge in restrooms and a pantry, among other places.

As SWAT team members cleared the temple Sunday, authorities found four dead inside the temple and three dead outside the temple, including Page.

Murphy, the officer who was shot multiple times by Page, underwent two surgeries at Froedtert Hospital on Sunday, Edwards said earlier Monday, one of them lasting for five hours. Edwards said the officer was resting comfortably at the hospital with family by his side.

Two other men were taken to Froedtert with gunshot wounds. They were in critical condition. They were identified by a temple leader as Santokh Singh and Punjab Singh.

The 50-year-old Santokh Singh's nephew, Gurjeet Singh, said in a statement, "This is a very difficult time for our family and the Sikh community. We ask that you respect our privacy. We pray for continued healing for all who were involved with this tragedy and thank those who are reaching out with support."

At a news conference at Froedtert, Gary Seabrook, director of surgical services, said doctors believe Santokh Singh was injured "with a single gunshot wound that penetrated his stomach, diaphragm and chest." He was operated on Sunday and was back in the operating room Monday for surgery to complete his treatment, Seabrook said.

No additional information was available about Punjab Singh, whose family declined to release information, Froedtert officials said.

Two members of the Sikh temple, Balbir Singh and Surinderpal Singh, said Monday morning that members of the temple were gathering at the home of the temple president who was killed.

"We will be gathering with our friends and family there," said Balbir Singh.

"There will be a household full of people," said Surinderpal Singh.

A Sikh human rights group is pledging $10,000 to Murphy.

New York-based Sikhs for Justice in a statement applauded the heroic actions of Oak Creek officers.

"This tragic incident is just one more example of the need for all ethnic groups to support each other and raise their voices against violence in our country and abroad," said G.S. Pannun, attorney and spokesman for the group. "Since 9/11 there have been innumerable instance of hate crimes against members of the Sikh community. Our government must take urgent steps to educate the country about the Sikh population and help put an end to these horrific and deadly acts of violence."