Three US troops wounded after Afghan soldier opens fire

Afghan army spokesman calls shooting a ‘mistake’ that was not deliberateShooter was shot dead at base in southern Helmand provinceAn Afghan soldier opened fire on Sunday inside a base in the southern Helmand province, wounding three US soldiers before being shot dead, an Afghan official said.Colonel Mohammad Rasoul Zazai, an army spokesman, said the soldier had made a “mistake” and had not fired deliberately. A coalition-run Twitter account said an Afghan soldier shot and