Baghdad, May 4 : Four Islamic State (IS) militants and two security members were killed in separate attacks in Iraq, security sources said. Acting on intelligence reports, the army's helicopter gunships chased a vehicle of IS militants and bombed it after spotting it in the mountainous area of Himreen in the northern part of Salahudin province, Khalil al-Bazi from Salahudin provincial police told Xinhua on Sunday. The bombardment resulted in the destruction of the vehicle and the killing of four IS militants aboard, al-Bazi said. In the eastern province of Diyala, one paramilitary tribal fighter, affiliated with Hashd Shaabi brigades, was killed and four others wounded in an attack by IS militants on a checkpoint manned by the Sunni tribal fighters in Edheim area in the northern part of Diyala, Alaa al-Saadi from the provincial police told Xinhua. In a separate attack, a soldier was gunned down when IS militants opened fire on a military base near the town of Qara-Tappa, some 175 km northeast the Iraqi capital Baghdad, al-Saadi added. Despite repeated military operations against the IS remnants, IS militants are still hiding in deserts, rugged areas as well as in Himreen mountain range which extends in the provinces of Diyala, Salahudin and Kirkuk. They are capable of carrying out frequent guerilla attacks against security forces and civilians. /IANS