SEATTLE — A Seattle police SWAT team Monday morning swarmed a home surrounded overnight but did not find suspected cop killer Maurice Clemmons inside.

A murder warrant has been issued for Clemmons, the man suspected of killing four Lakewood, Wash., police officers Sunday in a coffee shop, Pierce County sheriff's spokesman Ed Troyer said.

Police had surrounded the home late Sunday night and Troyer said the search of the house finished shortly after 7 a.m. Officers searched with a robot before SWAT officers moved in.

Officers are still searching the neighborhood, including nearby houses, for Clemmons. There is a $125,000 reward for information leading to his capture.

Clemmons was shot and perhaps seriously wounded by one of the slain officers Sunday morning, Troyer said.

"He has suffered a gunshot wound," Troyer said at a media briefing held just before 3 a.m.

Police know that Clemmons was wounded because they have detained other people — Troyer wouldn't say how many — who helped Clemmons after the shootings.

At the briefing, Troyer said police now consider Clemmons a suspect, rather than merely a "person of interest."

Police don't know the severity of Clemmons' wound, and Troyer said he may already be dead.

Investigators have no indication that Clemmons had a motive aimed specifically at any of the particular officers who were gunned down, Troyer said.

"He was upset about being incarcerated," Troyer said. "He was just targeting cops."

A trailer on the property where police first thought Clemmons was hiding was empty when officers entered it early Monday morning.

A short time earlier, they had issued an ultimatum for anyone inside the trailer to come out, but got no response.

That was followed by a series of flash-bangs, distraction devices which can temporarily blind a suspect. Discharges of what appeared to be tear gas followed.

SWAT teams and police negotiators had surrounded the house at East Yesler Way and 32nd Avenue South earlier in the day based on tips given to police.

Police responded to the home around 8:44 p.m. Sunday. A woman who was leaving the home was stopped by officers and told them Clemmons was on the property and bleeding.

The woman told police that someone had dropped Clemmons off at his aunt's home, on East Superior Street.

Clemmons' sister, Latanya Clemmons, said Sunday night she was near her aunt's house waiting to see what happens. She also said she and her cousin, Cicely, were trying to call their aunt and Maurice in the house but they were getting no answer.

Police told residents to stay inside and keep their doors locked.

One Leschi resident couldn't get back to his home Sunday night. Bo Peck, 52, and his wife just moved from Montlake to a home on East Superior Street this weekend, and he had gone back to get his last load from his old house. When he tried to get back to his new house, he found police had closed off all routes along Lake Washington Boulevard and Alder Street.

"Everything is blocked down there," Peck said. "My wife and daughter are alone down there, they're a little freaked out."

Charles and Heidi Markham live on East Superior Street. They arrived back in Seattle at about 1 a.m. Monday, returning from a trip to British Columbia. But police stopped them several blocks from their home.

"They told us it's blocked off and nobody can get in there," Charles Markham said. "They told us just to wait awhile."

Heidi Markham said: "It's a nice neighborhood. That's why this is kind of strange."

The couple has lived in the neighborhood for 42 years. They said they weren't worried, and that it seemed like police had the situation under control.

The series of events leading up to the house began more than 16 hours earlier at an upscale coffee shop in Parkland, Pierce County, a hangout for officers that became the scene of the deadliest attack on law enforcement in state history.

Four officers were shot and killed at 8:15 a.m. as they worked on their laptops at Forza Coffee Company in Parkland. The first two officers were "flat-out executed," while the third tried to stop the gunman and the fourth fired at him, sheriff's spokesman Troyer said.

Those killed were identified as Sgt. Mark Renninger, 39, and officers Ronald Owens, 37, Tina Griswold, 40, and Gregory Richards, 42.

Lakewood Police Chief Bret Farrar has scheduled a 10 a.m. news conference today to discuss the officers and the shooting.

Clemmons has a long criminal record in Arkansas and Washington. He was released from custody in Pierce County just a week ago, and was facing a charge of raping a child. Family members described him as being in a state of mental deterioration. Last spring, he was also accused of punching a sheriff's deputy in the face.

Sunday's shootings came as officers from across the state were still coming to terms with last month's ambush-slaying of Seattle police Officer Timothy Brenton. The two incidents do not appear related, police said.