According to the United Nations Office for the Coordination of Humanitarian Affairs, 522 residents of Nablus and surrounding refugee camps, including civilians, were killed and 3,104 injured during IDF military operations from 2000 to 2005. In April 2002, following the Passover massacre—an attack by Palestinian militants that killed 30 Israeli civilians attending a seder dinner at the Park Hotel in Netanya—Israel launched Operation Defensive Shield, a major military operation targeting in particular Nablus and Jenin. At least 80 Palestinians were killed in Nablus during the operation and several houses were destroyed or severely damaged.