One of the detained was an official cadre from the Kurdish group Pejak while the six others were important members, the hard-line daily Jomhouri Islami wrote.
The report said that Pejak had been responsible for the deaths of an agent of the State Security Forces (SSF) and two members of the paramilitary Bassij force over the Persian New Year period.
The western province of Kurdistan has been a hotbed of anti-government protests and since 2005 Kurdish youths have repeatedly clashed with security forces. A number of demonstrators have been killed by agents of the SSF during such clashes.
