Frazier Glenn Miller give Nazi salute.

(AP) — A man accused of fatally shooting three people at Jewish sites in Kansas declared “Heil Hitler!” and asked how many Jews he had killed after the attacks, a police officer who was at the scene testified Monday.

Frazier Glenn Miller, 74, is charged with capital murder in the April 13, 2014, shootings at the Jewish Community Center of Greater Kansas City in Overland Park, Kansas, and at a nearby Jewish retirement home. None of the victims was Jewish.

Prosecutors plan to seek the death penalty.

At a preliminary hearing to determine if there is enough evidence to put Miller on trial, Overland Park police Sgt. Marty C. Ingram, who was working off-duty at the Jewish Community Center, testified that he heard shots and saw the doors of the center’s theater shatter. He said he took cover as more shots hit the building’s facade.

“Dust, smoke was flying everywhere at that point,” he said. The gunman then drove away.

Miller is accused of killing Dr. William Lewis Corporon, 69, and his 14-year-old grandson, Reat Griffin Underwood, who were attending a singing contest audition at the Jewish Community Center.

Ingram found Corporon and his grandson, who was barely alive, outside in a truck.

“I realized the gentleman had sustained such horrendous head wounds that there was nothing I could do,” he said, recalling how he then heard a “tremendous scream” when Reat’s mother saw her mortally wounded son.

When he heard that a suspect had been arrested nearby, Ingram accompanied some witnesses to the arrest scene to determine if they could identify him. As they approached the patrol car where Miller was detained, he shouted “Heil Hitler!” and asked how many Jews he had killed.

Miller, of Aurora, Missouri, is also accused of killing 53-year-old Terri LaManno, who was visiting her mother at a nearby Jewish retirement home.

Miller, who has emphysema and needs oxygen from a tank to breath, muttered during breaks in the hearing about how Jews “owned Hollywood.”

“Google it,” he urged the court.

Thomas Bates, a former combat medic who worked at the community center, said he grabbed his medical kit when he heard about the shootings. When he reached the victims, Corporon was dead but Reat was still breathing. Bates said the teen had been shot in the head and there was little that could be done for him.

Paul Temme testified that he was getting his gym bag from his car when he heard gunfire. He dialed 911 and chased the shooter’s vehicle in a failed attempt to get his license details. But then the shooter stopped.

“He pulled a handgun out and fired at me,” said Temme, who ran for cover.

In phone calls to The Associated Press, Miller has said he thought he was dying because of his emphysema and felt he was fulfilling a patriotic duty by killing Jews. He regretted shooting the teenager, who he said looked older.

Miller, also known as Frazier Glenn Cross, is a Vietnam War veteran from southwest Missouri who founded the Carolina Knights of the Ku Klux Klan in his native North Carolina and later the White Patriot Party.

After a nationwide manhunt in 1987, federal agents found him and three other men at a rural Missouri home stocked with hand grenades and automatic weapons. Miller was indicted on weapons charges and accused of plotting robberies and the assassination of the Southern Poverty Law Center’s founder. He served three years in federal prison.

Miller also ran for the U.S. House in 2006 and the U.S. Senate in 2010 in Missouri, each time espousing a white-power platform.