TEHRAN (Reuters) - Iran said its troops killed or wounded 30 Kurdish rebels in a fresh assault on the mountainous border with Iraq where witnesses reported fierce fighting and shelling on Saturday. A commander of Iran's Revolutionary Guards said the military push was launched after giving the rebels a one-month "grace period" during Ramadan to withdraw from the area from where they have launched ambushes and sabotage attacks on gas pipelines. "The Revolutionary Guards forces have killed or injured 30 members of the PJAK (Party of Free Life of Kurdistan) terrorist group since Friday afternoon to now," Colonel Hamid Ahmadi told the official IRNA news agency. PJAK is an offshoot of the Turkey-based Kurdistan Workers Party (PKK), which has been pounded by Turkish air strikes in recent weeks. One Turkish air strike killed seven civilians late last month and on Saturday Iranian soldiers shot dead a Kurdish shepherd outside the border town of Haj Umran, according to the town's mayor, Maghdid Ahmed.