In this photo provided by police, bomb making materials recovered from Monfort's apartment are seen.

Monfort was shot Friday afternoon in a confrontation with Seattle police detectives at a Tukwila apartment complex.

At a news conference, Seattle Assistant Police Chief Jim Pugel said a .223-caliber rifle found in Monfort's apartment is an identical ballistic match to the weapon used to kill Brenton and wound his partner, Britt Sweeney, on Halloween night.

Officials released photos of the rifle, as well as pictures of bombs and bomb-making materials recovered from the apartment.

The Oct. 22 torching of a mobile command vehicle and two patrol cars did not injure anyone, but Pugel said investigators believe Monfort intended to kill with that attack.

The explosion that destroyed the large command vehicle was intended to lure officers to the scene, Pugel said, and a later detonation of explosive devices attached to two parked patrol cars was likely designed to kill first responders.

"Whoever did this clearly intended that firefighters and police officers be killed," he said.

Police recovered DNA from the remains of the makeshift explosives, and from a flier left at the scene that made reference to the "funerals" of officers.

The DNA was from the same person but it did not match anyone in a criminal database, Pugel said.

On Oct. 31, Brenton and Sweeney were sitting in their parked patrol car reviewing a traffic stop when a sedan pulled up alongside and someone opened fire, killing Brenton instantly. Sweeney was grazed by several bullets.

Pugel said a bandana decorated with red, white and blue stars and stripes was left about 20 feet behind Brenton's patrol car. DNA recovered from that bandana was a match to the DNA recovered from the firebombing, Pugel said.

According to court documents filed Monday, a similar bandana was found at the scene of the torched police vehicles.

On Nov. 6, while family and fellow officers were honoring Brenton with a memorial service at KeyArena, detectives got a tip that a car matching the description of a vehicle being sought in the killing was parked at a Tukwila apartment complex.

The Datsun sedan belonged to Monfort, and the tipster told investigators that the owner had covered it and had been acting strange since the killing, Pugel said.

When detectives confronted Monfort he pulled a gun and pointed it at them. "He pulled the trigger. It clicked, it didn't go off," Pugel said.

The detectives chased Monfort and shot him when he again turned and pointed the weapon at them, Pugel said. Monfort remains at Harborview Medical Center in serious condition.

Despite all the evidence linking Monfort to the crimes, investigators are still trying to determine exactly what prompted him to attack police.

"No known motives right now," Pugel said. "The investigation is still ongoing, so it could change."

The department's most recent contact with Monfort prior to the attacks was on the evening of October 15, when Seattle police issued Monfort a ticket for driving without insurance, Pugel said.

Two officers on patrol saw Monfort driving around, looking lost, Pugel said, and pulled him over when he turned without signaling. Monfort was written a ticket and the officers let him go.

"It was completely uneventful," Pugel said of the traffic stop. "He had very little, if any, criminal history that we know of."

Monfort was stopped about six blocks from where Officer Brenton was later murdered.

The fliers left at the scene of the torched police cruisers mentioned the case of former King County Sheriff's deputy Paul Schene, who was accused of beating a 15-year-old girl inside a holding cell. Schene has since been fired from the department.

The criminal trial of Schene was scheduled to begin this week, but prosecutors announced Monday that the trial had been postponed until January.

"That recess was granted due to recent events surrounding a potential connection between the Schene case and the homicide of Officer Brenton," said Ian Goodhew, deputy chief of staff for the prosecutor's office.

Goodhew said prosecutors are working with Seattle police to review evidence in the arson and Brenton's murder and have not yet reached a charging decision.

"We're reviewing all possible charges including aggravated murder, which includes the possibility of death," he said.