A Palestinian human rights group says assailants have beaten up guards and stolen a bus from a Christian school in Gaza. The Palestinian Center for Human Rights says the incident took place early Saturday morning at a school run by the Baptist Church. A Palestinian Christian who worked at the school was killed in October, and a nearby Christian bookshop was firebombed months earlier. Last month assailants detonated a bomb outside another Christian school. No arrests were made in any of the incidents. Since Hamas came to power a year ago, attacks on Gaza's 3,000 Christians have increased. The Muslim group denies involvement and says it's trying to protect the dwindling community.