Iran's Revolutionary Guards have killed 17 insurgents in clashes in northwestern Iran near the border with Turkey that saw four of its officers die, the official Islamic Republic News Agency reported Thursday.

The clashes were the second in a week between the Guards and insurgents: the elite force said Saturday it had killed 17 rebels, but reported no casualties on its side owing to the clashes.

IRNA said that fighting took place in inclement weather, but gave no additional details.

The news agency did not name an Iranian opposition group, however the Kurdish PEJAK, which for the "Party of Free Life of Kurdistan" in Kurdish, has sporadically engaged in armed clashes with Iranian forces during the past two years.