WOODBURN, Ore. -- A father and son could face the death penalty in a deadly bank bombing that killed two law enforcement officers in Woodburn.

Bruce Turnidge was unexpressive as he made his first court appearance Thursday morning. Turnidge and his 32-year-old son, Joshua, both face charges of aggravated murder, a capital offense in Oregon.

A probable cause statement filed in court revealed for the first time the details of the bombing that killed Oregon State Police bomb technician William Hakim and Woodburn Police Capt. Tom Tennant, and critically injured Woodburn Police Chief Scott Russell.

Anonymous call lead to bombs
At 10:19 a.m. on Friday, Dec. 12, a man called in a bomb threat to a Wells Fargo Bank in Woodburn, located on Highway 214 near the West Coast Bank branch. The man said "if they didn't leave the building, all of them would die," the court documents stated.

The man also said a cell phone would be found next to a garbage can, and that he would give further instructions on the cell phone.

Woodburn police searched the area around the two banks for other devices, and a green metal box was spotted next to the West Coast Bank building.

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Hakim, Tennant and Russell went to the West Coast Bank as well. After Hakim inspected and X-rayed the green box, he said he was confident it was a "hoax device" and that it could be "taken apart to be placed into evidence."

Hakim brought the green box into the bank to work on it, with help from Tennant and Russell.

West Coast Bank Customer Service Manager Laurie Ann Perkett saw Hakim trying to open the device while Tennant held it, and then it exploded, charging documents said.

 More: Joshua Turnidge probable cause statement (PDF)

Perkett said she heard the loud explosion and fled the building. She was hospitalized for injuries that included lacerations on her right leg and bomb shrapnel embedded to the bone of her right leg, but later released.

Hakim and Tennant were killed by the blast. Police Chief Russell lost his right leg above the knee in the blast; his left leg was mutilated and his jaw shattered, according to charging documents.

Russell remains hospitalized at Salem Hospital in stable condition, according to Marion County officials.

 Background: Read more on bombing and scheduled memorials

Local, state, federal agents move swiftly in investigation
The first arrest came Sunday night in the Salem area, just hours after a press conference was held in which police publicized pictures and a description of a "person of interest" in the case.

"The arrest was the result of an intensive round-the-clock investigation by an interagency task force comprised of federal, state, county, and city public safety agencies," Isham said. We know there is still a lot of hard work ahead of us, but this development will help bring relief to the local community and the officer's families."

Police searched Turnidge's NE Salem home all morning Monday after taking him into custody around 5 p.m. Sunday. They evacuated neighbors before making the arrest, fearing that there could be explosives inside the suspect's home.

The landlord told KGW that Turnidge moved into the home at the beginning of the month with his girlfriend and her two kids.

Turnidge appeared in court Tuesday morning for the first time. He got a court-appointed attorney and did not enter a plea. His next scheduled court date is Dec. 26.

Picture of suspect emerges
Public records show Joshua Turnidge is divorced, has worked as a steelworker and has lived in various Oregon communities as well as in Nevada and Washington state. The records show he served in the Navy at Great Lakes, Ill.

 Slideshow: Person of interest in bombing

Landlord Randy Jacobsen said he had recently agreed to let Turnidge move into the house at a reduced rate in exchange for refinishing the hardwood floors and other renovations. He said Turnidge watched football every Sunday and was trying to build an alternative-fuel business. He described Turnidge as "very hard working, upstanding guy" and said he'd be shocked if Turnidge turned out be guilty.

Coworkers tell KGW that Turnidge worked for a wireless company as a technician.

 More: Turnidge has no Oregon criminal record

Police make arrests in bombing

Bruce Turnidge was arrested Tuesday, the day his son made his first court appearance. A probable cause statement released Thursday said Bruce Turnidge faced the same charges on which his son was accused: six counts of aggravated murder, two counts of attempted aggravated murder, two counts of assault, two counts of unlawfully possessing and manufacturing a destructive device, and conspiracy.

  Slideshow: Joshua Turnidge in court

Neither man has entered a plea. But Bruce Turnidge's attorney, John Storke, told the court Thursday that his client would plead not guilty.

Bruce Turnidge is scheduled to return to court Dec. 26 to enter a plea at his arraignment.

Investigators said they found explosives and apparent bomb-making material in a search of Bruce Turnidge's home.

Some of the items matched those of the bomb that detonated in the bank last Friday, according to recently released charging documents.

The document said the explosive Tyvex, angle iron, sheet metal, metal grating, bolts, wiring and plywood with green spray paint matching the color of the bomb's housing box were among the items found in Bruce Turnidge's house. Some materials were also found in a nearby stream.

An officer said that he overheard Joshua Turnidge's girlfriend telling Bruce Turnidge on the telephone that officers had inquired about welding equipment and barrels.

When they arrived at the farm home Sunday night, Bruce Turnidge was gone. His wife, Janet, told authorities he had gone for a walk on what officers noted was a "cold, dark, snowy" night, the document said.

He returned "several hours later, offering no explanation for his sudden disappearance," it said.

The search on Tuesday also turned up a badly burned laptop computer, welding machinery and a blasting cap, the document said.

ATF agents believed "some type of black or smokeless powder was used in the fabrication" of the West Coast Bank bomb, according to charging documents.

Prosecutors have not offered a motive for either father or son to plant explosives at the small Woodburn bank.