Masked Palestinian militants from various groups, including the Islamic Hamas movement, attend a press conference in Gaza City, Sunday, April 3, 2011. Israel warned its citizens in Egypt's Sinai Peninsula to evacuate immediately Saturday, hours after launching an airstrike that killed three Hamas militants accused of planning to abduct Israelis over the upcoming Jewish festival of Passover. The Islamic militant group Hamas called the strike "a crime" and vowed revenge. Photo by Ashraf Amra