Officials say an Afghan police officer opened fire inside a police station while U.S. forces were visiting, sparking a firefight that killed two U.S. troops and three Afghan policemen.

Monday's incident in Wardak province appears to be the latest in a series of insider attacks against coalition and Afghan forces. It comes a day after a deadline given by Afghans for U.S. special forces to withdraw from the province.

Deputy provincial Police Chief Abdul Razaq Koraishi says three Afghan officers were killed. A coalition military official says two U.S. forces were killed. The official spoke on condition of anonymity to disclose information pending an official statement.

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