U.S. intelligence officials have identified four terrorists allegedly responsible for planting the bomb that destroyed Pan Am Flight 103 last December over Scotland, killing 270 people, the London Sunday Telegraph said. It quoted unidentified officials as saying the key figure in the attack was Hafez Kassem Dalkamuni, a 43-year-old Palestinian from the Popular Front for the Liberation of Palestine-General Command. The paper said he is in prison in West Germany awaiting trial for possession of explosives. The newspaper said another suspect, Khalid Jaafar, 21, of Lebanon, was apparently aboard Flight 103 when it exploded. It said two other suspects were held briefly by West German police before the bombing on explosives charges but were released for lack of evidence.