An Israeli helicopter launched three missiles Sunday afternoon at a building in Gaza City housing radio stations affiliated with the militant Hamas group and Palestinian leader Yasser Arafat's Fatah party. The airstrike took place just hours after Palestinian gunmen ambushed and killed a pregnant Jewish settler and her four young daughters as they were traveling out of Gaza. The missiles, which hit the top corner of the 14-story building near the radio stations' offices, caved in part of the roof and cut off electricity to the building.