(KUNA) -- Masked gunmen assassinated Thursday Raeed Al-Nahaal, the leader of Al-Nasser Salahudeen military brigades of the Popular Resistance Committees in northern Gaza Strip. A Palestinian source said masked gunmen opened fire on Al-Nahaal in an area in northern Gaza Strip this morning. He was with his family when the gunmen attacked him, according to the source. Meanwhile, a statement by Salahudeen Brigades accused the assassins of being "Mercenaries used by the Israelis". The group sworn vengeance for the assassination of the leaders and called upon Palestinians "to purge elements that are creating tensions amongst them."