The insurgency by the Kurdish Democratic Party of Iran surged in 1989, lasting until 1996, as part of the Kurdish separatism struggle. The eruption of the conflict in July 1989 was caused by the assassination of KDPI leader Abdul Rahman Qassemlou by suspected Iranian government agents. The most violent episodes took place in 1990 and 1991, when Kurdish soldiers launched massive attacks on Iranian military bases in Kurdish areas of Iran. This brought heavy retaliation from the Iranian government, aiming to eradicate the KDPI leadership by assassinating Sadegh Sharafkandi and other KDPI leaders in 1992 in order to disable the Kurdish party's ability to function. The conflict faded with the effective targeted assassination policy of Iran and by 1996 KDPI was no longer able to function militarily and announced a unilateral ceasefire. The conflict claimed hundreds of lives, mostly Iranian government troops and Kurdish militants.