The Gaza War is said to have begun when Israel started an air strike against the Gaza Strip on Dec. 27. This was after a six-month truce between Israel and Hamas had run out and Hamas had resumed rocket attacks against Israel. Israel's said its aim was to stop Hamas' rocket attacks on Israel from and arms import into the territory. Israeli forces attacked military targets, police stations and government buildings. Hamas intensified its rocket and mortar attacks against Southern Israel, reaching the major cities of Beersheba and Ashdod for the first time. An Israeli ground invasion began on January 3, 2009. The war ended on January 18, when Israel first declared a unilateral(one-sided) ceasefire, followed by Hamas' announcing a one-week ceasefire twelve hours later. Israel completed its withdrawal on January 21. The conflict resulted in between 1,166 and 1,417 Palestinian and 13 Israeli deaths.