A car exploded in the southern Gaza Strip on Tuesday, killing four Palestinian terrorists and wounding another, threatening to upset truce talks between Israel and Gaza's Hamas rulers. There was no immediate word on the cause of the blast, which destroyed a blue Subaru in the southern town of Khan Younis. Dr. Moaiya Hassanain of the Palestinian Health Ministry said four people were killed and person wounded critically. Islamic Jihad, a violent Iranian-backed group, said all five were members of the group. The blast occurred as Israel and Hamas were trying to complete a cease-fire deal after months of Egyptian mediation. The Israeli army had no immediate comment. Israel often attacks Palestinian terrorists in Gaza, though militants have also died in accidental explosions while transporting weapons. The Palestinians claimed the car was hit by IAF aircraft.