LASHKAR GAH, Afghanistan - Six Afghan policemen were killed in Helmand province in a so-called "insider" attack involving a rogue Afghan policeman and a chef, local officials said on Saturday.

The Taliban took responsibility for the attack, saying they had dispatched a "mujahid who had infiltrated and penetrated the police ranks", spokesman Qari Yousuf Ahmadi said.

The policeman and chef working for the officers approached a police checkpoint in Helmand's Grishk district on Friday where they opened fire and shot dead two of their colleagues, the provincial governor's office said in a statement.

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