A Taliban suicide bomber killed five U.S.-led coalition troops and four Afghan service members Saturday, after detonating his explosives-filled vest inside a coalition base in eastern Laghman province. The attack, which also injured scores of coalition and Afghan troops, was one of the deadliest such incidents for international troops in recent years. The Taliban claimed that the attacker was an Afghan National Army recruit. If true, it would be one of the most spectacular in a string of attacks on American and Afghan troops carried out by insurgents who had infiltrated the ranks. Earlier this month, an Afghan border policeman shot and killed two U.S. soldiers in Faryab province, in the north. And, just on Friday, a suicide bomber wearing an Afghan police uniform assassinated the police chief of southern Kandahar province.