An Afghan policeman opened fire on US troops inside a police station in eastern Afghanistan, killing an American soldier and wounding several other people, officials said on Monday. US soldiers subsequently killed the policeman. The shooting took place on Sunday in Paktia province. Paktia provincial police chief Gen Esmatullah Alizai confirmed that a policeman had shot an American soldier. A statement from the International Security Assistance Force (ISAF) issued on Monday said that an 'altercation' took place in the station. "While at the district centre, there was an altercation during which an ANP (Afghan National Police) officer and one ISAF soldier were killed," the statement said.