A bomber blew himself up amid a crowd of workers outside a U.S. military base in eastern Afghanistan on Tuesday, killing 10 and wounding at least 14 others in the deadliest suicide attack in four months, The Associated Press quoted officials as saying. The attacker, who also died, triggered explosives strapped to his chest among the workers as they lined up outside the base in the city of Khost, said Jamal Arsalah, the governor of Khost province. Maj. Matt Hackathorn, a U.S. military spokesman, said there was no immediate word of any U.S. military casualties. The governor, who visited the scene shortly after the explosion, said the Afghan casualties were among hundreds of workers waiting to enter the base, known as Camp Salerno, through its main gate.