Palestinian families who fled their homes because of the Israeli military offensive in the Gaza Strip take shelter at a school run by the United Nations in Gaza City on January 6, 2009. An Israeli strike today killed at least 40 people who had taken refuge inside a UN school in the Gaza Strip, the third such attack in a day, medics said. The strike hit near a school run by the UN agency for Palestinian refugees, UNRWA, in the northern town of Jabalia, they said.