A number of US troops have been injured when an Afghan soldier opened fire at their convoy in Khost province, the third such accident in less than two months. Local officials in eastern Afghanistan announced on Sunday that an Afghan soldier opened fire on a US convoy injuring several US troops late Saturday, IRNA reported. The officials who wanted to remain unnamed added that the Afghan soldier was also injured during the incident. However, it was not clear whether he was shot by the US soldiers or himself. This is the third time such an accident has happened in the...