An blast ripped through a house in the southern Gaza Strip on Saturday, killing at least three Palestinians, witnesses and medical workers said. The source of the blast was unclear. An Israeli army spokeswoman said Israel was not involved. According to Reuters, medical sources said two young children and a woman died and at least two others were hurt. Residents searched through the rubble of the house for other survivors. Witnesses described a loud blast in a village east of the southern Gazan town of Khan Younis near the border with Israel. Meanwhile, a bomb planted beneath a car used by the Hamas police force exploded early Saturday in the Gaza Strip and caused damage to the vehicle, the Hamas Interior Ministry said. A statement by the ministry, cited by DPA, said the identities of those who set the bomb off were unknown, adding the attackers were "trying to restore anarchy and disorder." The ministry also stated that a car belonging to a firefighter from the Hamas-run Civil Defence Department was burnt in Gaza City by unknown people.