Palestinian Islamic Jihad (PIJ) is backed by Iran, and its headquarters are in Syria. From 5 to 7 August it fired 600 rockets and mortars into Israel. Israel retaliated with jets, drones, helicopters, tanks, artillery and elite commando units against PIJ military bases, weapon production sites, rocket launching sites, and observation posts. Two PIJ cells were hit, killing twelve operatives and several civilians. Israeli military called this operation Breaking Dawn and said it could last a week. At 11.30 am on 7 August a truce was called. Israel had inflicted significant losses on PIJ in those three days, including killing two senior commanders. By the 11th a further eight individuals with ties to terrorism were arrested in Gaza. PIJ was still insisting on the release of prisoners from Israeli jails, warning that their continued custody was grounds for violence to breakout again.