(Adds details, background) GAZA, Oct 22 (Reuters) - A car carrying Hamas militants blew up in the Gaza Strip on Monday, injuring at least three people, Hamas officials and medical workers said. Hamas said it believed the blast was caused by a roadside bomb. Tensions remain high in Gaza between Hamas and other armed Palestinian groups four months after Islamists took control of the territory. An Israeli army spokeswoman said Israel was not involved in the attack. Medical workers said three Hamas security personnel were wounded in the explosion on a coastal road in central Gaza. Hamas has in the past accused members of Palestinian President Mahmoud Abbas's Fatah faction of carrying out attacks against its security forces. But Hamas has clashed in recent days with clan members associated with Fatah as well as the Islamic Jihad militant group.
