US-led coalition forces mistakenly killed five Afghan police in a clash in a southern province, the government said Friday. There was no immediate comment from the coalition. The police were manning a checkpoint in Gereshk district in Helmand province when the clash broke out around 7:00 p.m. (1430GMT) on Thursday, said Interior Ministry spokesman Zemeri Bashary. "Coalition forces mistakenly opened fire on police," Bashary said. "Unfortunately five policemen were killed."