WASHINGTON (AP) _ Thomas Eugene Spinks, one of three men accused of bombing 10 abortion clinics in Washington, Maryland, Virginia and Delaware, faces a possible 15 years in prison and $20,000 in fines after pleading guilty to one count each of conspiracy and malicious destruction.

Spinks, 37, a roofer and chimney sweep from Laurel, Md., entered his plea in U.S. District Court in Baltimore on Friday.

Assistant U.S. Attorney Robert B. Green said in court that prosecutors have evidence that at least seven other people were involved in the bombings in 1984 and early 1985. He refused to name them.

Spinks is to be sentenced by Judge Alexander Harvey II in June. He has been held without bond since his arrest in January.

Spinks' plea leaves Michael Donald Bray, 32, of Bowie, Md., and Kenneth William Shields, 34, of Laurel, facing trials on May 13 and June 3, respectively, on the charges. They are charged with conspiracy to damage property and possess illegal destructive devices and with possession of bomb ingredients and other destructive materials. Both have pleaded innocent.

There was extensive damage to the buildings that were bombed, most of them in the Maryland suburbs outside Washington, but no injuries were reported.