An Afghan soldier opened fire on his colleagues inside a US military base, killing five and wounding six others before he was himself shot dead, the US military said.The soldier had just finished a spell of guard duty at the base in the southern Afghan province of Helmand and the motive for the shooting was unclear, said a US statement. The shooting occured at the base in Helmand’s Gerishk district, some 530 kilometers (around 330 miles) southeast of the capital Kabul, Afghan Defence Ministry spokesman Mohammad Zahir Azimi told AFP.Full Story