Authorities are investigating whether a man whose home and yard harbored the remains of at least 11 people is connected to any killings in places he lived while in the military, including Japan, California and the Carolinas. The FBI told Cleveland police that the agency will investigate any leads in the case against Anthony Sowell, 50, who served in the Marines from 1978 to 1985, said Scott Wilson, an FBI spokesman in Cleveland. FBI behavioral specialists visited the Sowell property during the weekend and will try to develop a profile of the killings that could help determine whether investigations need to be opened or reopened elsewhere, Wilson said. Sowell was stationed at various times at Parris Island, S.C.; Cherry Point, N.C.; Okinawa, Japan; and Camp Pendleton, Calif. The city of East Cleveland is also reviewing three unsolved slayings in 1988 and 1989, after Sowell returned there from service in the Marines and before he went to prison for attempted rape, said Sgt. Ken Bolton, a detective for the police department in the Cleveland suburb.