Afghanistan's border police say a U.S.-led coalition warplane has mistakenly killed 12 police officers in the eastern part of the country.
Afghan Commander Abdul Rahman said the aircraft attacked a patrol Thursday in Paktika province.
A coalition spokesman says the report is being investigated. He had no further details.
U.S.-backed coalition forces began investigating in April two cases in which civilians and Afghan security forces may have been killed by friendly fire.
Coalition forces are hunting down Taleban insurgents in the province.
Earlier, Afghan officials said two suicide bomb attacks in the south of the country wounded seven Afghan policemen and one foreign soldier.
Some information for this report was provided by AFP, AP and Reuters.