In the second incident, unknown armed men attacked a police base situated on a road in the outskirts of Sanandaj in Kordestan province early on Saturday morning, Press TV said.

During the attack, the armed group killed an Iranian police officer and injured four others, the report said.

Restive region

Iran's western provinces have been the scene of regular armed clashes between Iranian security forces and Kurdish separatists, in particular PJAK, an anti-Iranian Kurdish group linked to Turkey's outlawed Kurdish Workers' Party (PKK).

The PKK took up arms in 1984 to fight for a Kurdish homeland in southeast Turkey and is recognised by much of the international community as a terrorist group.

Some Iranian analysts said that PJAK rebels had bases in northeastern Iraq from where they operated against Turkey, Iran, and Syria.