AURORA, Mo. — The killings of three people on the eve of Passover outside two Jewish facilities in a Kansas City suburb are being treated as hate crimes, law enforcement officials said Monday.

Overland Park Police Chief John Douglass and others confirmed that the evidence gathered in Sunday’s shootings supports a hate crime presentation to a federal grand jury. State charges could also be sought, state and federal prosecutors said at a televised news conference.

Meanwhile, as President Obama led a shocked nation in prayer after the deadly shootings, officials searched for clues about the 73-year-old man, believed to be a white supremacist and an anti-Semite, who is in jail in connection with the killings.

Frazier Glenn Cross, 73, is being held on a preliminary charge of first-degree murder after Sunday’s attacks in Overland Park, Kan. A doctor and his 14-year-old grandson were killed in the parking lot at the Jewish Community Center of Greater Kansas City and a woman was killed a short time later in a parking lot at Village Shalom, a nearby community for seniors, police said.

[Updated, 10:53 a.m. PDT April 14: Authorities on Monday officially identified the three victims as Reat Griffin Underwood, 14, his grandfather, William Lewis Corporon, 69, and Teresa Rose Lamanno, 53, of Kansas City. Reat and his grandfather were Methodists. Lamanno was a Catholic.]

The Southern Poverty Law Center, which tracks hate groups, identified the suspect as an avowed white supremacist who also used the name Frazier Glenn Miller. The center said Miller is considered a “raging anti-Semite” who was the former grand dragon of the Carolina Knights of the Ku Klux Klan, which he founded and ran in the 1980s before being sued by the law center for operating an illegal paramilitary organization and using intimidation tactics against African Americans.

Once the target of a national manhunt, he served three years in federal prison after being indicted on weapons charges and for plotting robberies and the assassination of Morris Dees, founder of the Poverty Center. As part of a plea bargain, Miller testified against other Klan leaders in a 1988 sedition trial.

Speaking at an Easter prayer breakfast at the White House, President Obama condemned the attack and urged Americans to block violence against any religion.

“No one should ever have to fear for their safety when they go to pray,” Obama said. “It has no place in our society,” he added.

Atty. Gen. Eric H. Holder Jr. earlier said his department would examine whether any federal crimes were violated.

“I was horrified to learn of this weekend's tragic shootings outside Kansas City. These senseless acts of violence are all the more heartbreaking as they were perpetrated on the eve of the solemn occasion of Passover," Holder said in a statement.

“Justice Department prosecutors will work with their state and local counterparts to provide all available support and to determine whether the federal hate crimes statute is implicated in this case.”

On Monday, a black sheriff’s SUV was parked in front of Cross’ home on a remote farm road in Aurora. The ranch house is surrounded by fields and pastures where cattle were grazing. Two black labs were running free in the yard, the garage door was open, a Confederate flag was in the corner. Neighbors had different views of the suspect.

“He’s quite notorious around here,” said farmer Jack Ebert, who said he lives down the road from the man he knew as Miller. “He was very racist. I never had any contact with the man but I know people who have. He didn’t like anyone who wasn’t like him. He was particularly racist against blacks but it doesn’t surprise me that he attacked a Jewish center. It fits in with his mentality.”

Ebert said Cross lives on Farm Road 1220 not far from the village of Marionville, Mo., and keeps to himself. “He’s pretty much a lone duck,” he said of his neighbor. “He marches to a different tune.”

Neighbors said Cross’ son, Jesse Miller, was shot and killed in 2008 by police in nearby Marionville after approaching officers with a shotgun.

According to the Springfield News-Leader, Jesse Miller was driving his sport utility vehicle and was involved in an accident with a pickup truck just west of the city limits. Joseph M. Rich, 55, stopped his converted school bus to help the drivers and a woman riding in Miller's vehicle, according to the Missouri Highway Patrol.

Jesse Miller pulled a 12-gauge shotgun from his vehicle and shot Rich, the patrol reported.

A few minutes later, Marionville Police Officer Andy Clark arrived and ordered Jesse Miller to put down his weapon. He then shot and wounded Clark, who returned fire with his AR-15 rifle and killed Miller, the patrol said.

“The father went around here for years saying that the cop shot his son in the back,” Ebert said. “We all knew that wasn’t true. The policeman told him to stop when he came at him with a shotgun.”