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Santelle said he didn't believe Page had a criminal record. He added that investigators are still tracing the history of the 9mm handgun Page used. But Santelle said that he thought it had been purchased legally in Wisconsin.

The gun used in the temple shooting has been traced by the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives, said Tom Ahern, spokesman for the agency. Under an urgent trace request, the ATF has determined the original buyer of the weapon. Ahern said it is up to Oak Creek police to release information on the gun purchase.

At the news conference, ATF Special Agent in Charge Bernard Zapor said of the gun, "We know of its origin. We know where it came from," and "how it ended up in the hands of this killer."

But other than to say it was a 9mm handgun and that a number of magazines were found at the scene, Zapor would not disclose anything else about the gun.

However, sources familiar with the investigation said Page bought the gun at Shooters Shop in West Allis, Wis.

The gun was purchased July 28 and picked up July 30, less than a week before the shooting.

Page received a general discharge from the Army, meaning that he could legally buy a firearm. Had he received a dishonorable discharge, he would have been prohibited from purchasing the weapon.

Shooters Shop owner Kevin Nugent said Monday federal agents had not visited him on the purchase and he could not confirm that Page bought the gun at his store.

Law enforcement officials have been investigating the Cudahy duplex where Page lived. The block on E. Holmes Ave. was cordoned off for a time Sunday night as officials investigated inside, and residents were evacuated from their homes.

The officers came out of the duplex around midnight, carrying large items.

Edwards, the Oak Creek police chief, said investigators carefully searched the house because they were concerned it might be booby-trapped.

At the Monday news conference, FBI Special Agent in Charge Teresa Carlson said investigators were able to safely enter the residence. She provided no details of what they found.

She said there was no indication the suspect was capable of such violence.

But Carlson said investigators were trying to find Page's family and associates to speak with them, although she stated there was no reason to believe anyone else was associated with the shooting.

She also said the FBI was looking at Page's possible ties to white supremacist groups, but she noted there was no active investigation of Page until Sunday.

Carlson said at the briefing, "Senseless acts of violence like this are completely unacceptable and when targeted at a place of worship particularly reprehensible. I want everyone to know that the FBI is going to do everything in our power to fully and efficiently investigate this case and we are also going to do everything in our power to prevent this from ever happening again."

Page is believed to have worked as a truck driver with Granger, Iowa-based Barr-Nunn Transportation, from about April 2006 to August 2010 while living in North Carolina. An employee at the company said he left "involuntarily" but declined to elaborate.

Records from the Cumberland County, N.C., Sheriff's Department show Page was issued five permits to purchase pistols in May of 2008.