SEATTLE - Police surrounded a house in the Renton, Wash., area Monday night as they continue the hunt for suspected cop killer Maurice Clemmons.

A relative of Clemmons lives at the house and was taken into custody, but authorities are still looking for Clemmons, according a law enforcement source.

The relative is believed to have helped Clemmons elude capture, the source said.

Clemmons has been getting help and shelter from friends and relatives since shortly after the Sunday morning shooting deaths of four Lakewood, Wash., police officers, authorities have concluded.

"Basically, there's no way that he could be doing this by himself; he was shot in the abdomen," said Sheri Badger, Pierce County spokeswoman at the incident command center.

Also frustrating to law-enforcement officers is that Clemmons reportedly told acquaintances the night before the attack to "watch the news" because he was going to "kill cops."

No one reported his comments to police until after the attack, Badger said.

The hunt for Clemmons has stretched deep into its second day, frustrating police as they chase lead after lead across two counties.

A murder warrant has been issued for Clemmons, and officers thought they had him Clemmons surrounded in a Leschi home late Sunday. But when a SWAT team finally went in at 7 a.m. PST Monday, the house was empty.

Authorities have since confirmed Clemmons was in the Leschi, Wash., area last night, though it isn't clear how he escaped or where he went, a source said.

Since then, officers have crisscrossed Seattle, chasing down alleged sightings and blood trails. Clemmons was shot and perhaps seriously wounded by one of the slain officers on Sunday morning, Pierce County sheriff's spokesman Ed Troyer said.

Shortly after noon PST Monday, notice went out for officers to be on the lookout for a green 1997 Mazda Millenia that had been registered to Clemmons' wife, Nicole Cheryleen Smith. They said the car might be headed toward Arkansas, where Maurice Clemmons once lived.

Washington State Patrol trooper Cliff Pratt said every trooper patrolling the state's highways had been alerted to look for the car, and that troopers are watching all major exits from the state.

He said they're also watching train and bus stations, and other transportation hubs.

But by 3 p.m., troopers had been told they could stop looking for the car. It had been found, and was sold two months ago.

About 1 p.m., six officers in SWAT gear pulled up to Smith's Tacoma home and four went inside, escorted by a young man who pulled up in a silver Honda.

In Seattle, police have followed clues that led them to the University of Washington, Beacon Hill, Ravenna, the International District and Leschi. So far, none have panned out.

"We're responding to citizen calls," Seattle police Sgt. Don Smith said.

At 2 p.m., officers were just leaving Cowen Park in Ravenna, Wash., where a trail of fresh blood had been reported about noon.

Not long before, officers had closed off a street and at least one building near Maynard Avenue South and South Dearborn Street, after bloody gauze was found in the street.

Before that, officers had raced to Jose Rizal Park in Beacon Hill after someone reported seeing Clemmons there. By 10:30 a.m., officers had walked the park with police dogs and were confident Clemmons wasn't there.

And earlier in the morning, police swarmed to the University of Washington after someone reported seeing Clemmons getting off a Metro bus at the campus. That search led officers to near the UW Medical Center and apparently into a classroom, but Clemmons wasn't there.

There is a $125,000 reward for information leading to Clemmons' capture.

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

Badger said every hospital in Washington's King, Pierce, Thurston and Snohomish counties has been told to contact police if a patient shows up for treatment of a gunshot wound.

Lieut. Dave McDonald of the Puyallup Police Department said Monday detectives believe Clemmons was armed with more than one handgun during Sunday morning's attack. One handgun used in the shootings was recovered at the coffee shop where the four officers were slain. Police think he dropped it during a fight with one of the officers. He was able to kill that officer, likely with a second handgun

Police found blood in his white Chevrolet pickup, which was found Sunday in a supermarket parking lot in Parkland, Wash. They also have eyewitness statements placing Clemmons in Leschi Sunday night.

Investigators have no indication 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."

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

Police responded to the home around 8:44 p.m. PST 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 someone had dropped Clemmons off at his aunt's home.

The series of events leading up to the standoff at house in Leschi 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, Pierce County sheriff's spokesman Ed 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 held a news conference Monday morning.

"We're a young department. They were good people and we'll miss them very much," he said. "We will get through this but it is a very, very tough time for us and the families of our fallen officers. I met with the families yesterday; it was the hardest thing I've ever done."

Farrar said he has "no doubt this person will be brought to justice."

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.

The coffee shop, in a strip mall across the street from McChord Air Force Base, is favored by officers from several nearby jurisdictions.

Troyer said the scruffy-looking gunman entered the shop, walked past the officers and three or four other customers, and approached the counter.

A young barista asked the man if she could help him, according to Humberto Navarrete, 51, who lives nearby and later spoke to the barista. The man stared at the barista without saying a word and then opened his coat, revealing a handgun, Navarrete said.

The barista and another female barista on duty ran out the back, according to Navarrete. The gunman turned and started shooting at the officers, he said, quoting the women.

"This was a targeted, selective ambush," Troyer said.

The officers, who made up one patrol unit, were regulars at the coffee shop. They were wearing bulletproof vests and were preparing to start their day shift, Troyer said.

The first two officers apparently had no time to react. The third officer stood up and tried to go for the gunman before being shot, Troyer said. The fourth officer struggled with the gunman, wrestled him out the door and managed to fire off some shots before he, too, was killed, Troyer said.

It's not clear if the gunman was injured by gunshots.

"It's carnage out front everywhere," Troyer said, describing the front of the coffee shop. "It's like a bad horror movie, it's horrible."

Navarrete, a financial manager who lives a block from the coffee shop, said he was in a nearby AM-PM minimart Sunday morning when the two baristas from the coffee shop ran into the store crying and upset.

Brad Carpenter, CEO of Forza Coffee, met with the two young baristas after they were interviewed by police and said they were shaken up.

The slain officers were "well-known to our staff," said Carpenter, a retired police officer from Oakland, Calif., and Gig Harbor.

"It's supposed to be a safe haven for everybody," he said of the coffee shop.

The shootings rank as the worst attack on law enforcement in state history. Three Seattle police were shot and killed by a gunman in January 1921.

Carpenter, the Forza CEO, said donation boxes to help the families of the slain officers will be in place Monday at all 22 Forza stores in Washington and Colorado, and that information would be placed on the company Web site about making contributions.

Several hundred mourners gathered at Champions Centre, a church in Tacoma, for a memorial service for the officers Sunday night. And a procession of vehicles accompanied two vehicles that transported the bodies from Parkland to the Pierce County Medical Examiner's Office in Tacoma.