Iranian state radio says three Kurdish separatists and one Iranian soldier were killed in a shootout in the northwest of the country. The report said the shootout happened Wednesday night in the mountainous region of western Iran near the Iraqi border. Two other separatists were injured. Thursday's report said the separatists were affiliated with Iran's Kurdistan Democratic Party. Iran has also been fighting another Iraqi-based Kurdish separatist group, known as the PEJAK. It is the Iranian wing of the Kurdistan Workers' Party, which is fighting for Kurdish autonomy in Turkey.