KABUL (Reuters) An Afghan soldier opened fire on NATO troops, lightly wounding one alliance soldier, the international force in Afghanistan said on Sunday, the latest in a string of attacks by rogue Afghan forces. Major Marcin Walczak, a spokesman for the NATO-led International Security Assistance Force, said the Afghan soldier fled after opening fire on a group of NATO and other Afghan troops in Ghazni province, southwest of Kabul, late on Saturday. NATO did not identify the nationality of the wounded soldier. The NATO-led force in Ghazni is mainly manned by Polish troops. A Taliban spokesman using the name Zabihullah Mujahid said the Afghan attacker had joined the insurgent movement after witnessing brutalities against Afghans, and the man he had wounded was Polish. NATO forces have been attacked several times in the past by rogue Afghan security force members. In each case, the Taliban have claimed to be behind the attacks and that members of the group have infiltrated Afghan security forces. In November, an Afghan police trainee killed five British soldiers at a checkpoint. In December, an Afghan soldier killed and American and wounded two Italians at a joint base.