The task force investigating the unsolved killings of about 30 women is participating in a two-hour television special that will be broadcast nationally in hopes of developing new leads, officials said.

To help gather information from the public, an international 800 telephone number will be established starting with the Dec. 7 airing of the program. The phone number will remain in operation for approximately three weeks, the San Diego County sheriff's department said."During the last three years, the greater San Diego area has experienced a series of unsolved female homicides," the department said in a release dated Wednesday and received Friday. "Similar homicides have occurred in Seattle, Wash.; Salt Lake City, Utah; New York, N.Y.; and Nashville, Tenn. The purpose of the nationwide live telecast is to enlist any information from the public regarding the series of unsolved female homicides that have occurred in these cities."

The San Diego area killings began in 1985, soon after the series known as the Green River slayings came to an apparent end in the Pacific Northwest. In both instances, the victims primarily were prostitutes and other street people, and at least some were strangled.

It is known that the early victims in the Green River case were strangled. Police later refused to discuss causes of death and attributed them only to "homicidal violence."

Authorities have speculated the Green River killer, blamed for 40 killings and eight disappearances, may have moved south to the San Diego area.

In San Diego, deputies, police and district attorney's investigators have formed the San Diego Metropolitan Homicide Task Force to investigate the local killings, at least 10 of which are believed to be linked. The San Diego task force is similar to the Green River task force based in Seattle.

The Seattle chapter of Crime Stoppers, with New Screen Concepts and Lexingon Broadcast Services, produced "Manhunt Live."

The bodies of the first five victims in the Green River case were found in the south King County river in 1982. The case has been described by police as the nation's worst unsolved, recognized serial murder puzzle.