Investigators searching for the suspected killer of four Seattle-area police officers have rounded up several of his relatives and friends to keep them from helping him escape, a sheriff's spokesman said Monday.

Police have brought in five or six relatives and other acquaintances of Maurice Clemmons, "and we expect that number to grow," Pierce County Sheriff's Department spokesman Ed Troyer said. ...

"What we're going to do is eliminate those people, so he'll have no place to go," Troyer told CNN. A raid in the southern Seattle suburb of Renton late Monday was aimed at cutting off Clemmons from that support network, he said.