In Afghanistan, three US troops were killed and another wounded during a joint operation in the eastern Nangarhar province.<br/><br/>The wounded soldier has been evacuated for medical treatment. In a statement yesterday the Pentagon said, the attack is in the latest, so-called insider attack on international forces.<br/>'<br/>Both Taliban and Islamic State terror group have claimed responsibility for the deaths in the volatile district of Achin.<br/><br/>Yesterday's attack came just hours after an US air strike killed and wounded at least six Afghan policemen in southern Helmand province, in the latest "friendly fire" incident. Such strikes have bred deep mistrust between local and foreign forces.'''