The ground invasion that began Jan. 3 follows a week-long aerial assault on targets across the densely populated territory. The United Nations estimates that a quarter of those killed have been civilians; both sides have rejected calls for a cease-fire. Israel is seeking to stop Hamas, an Islamist movement that rejects Israel's right to exist, from launching rockets into southern Israel. Here are the major attacks as of Jan. 3.
SOURCE: Staff reporting, staff researcher Robert E. Thomason, Palestinian Center for Human Rights, Israeli military and police, B'Tselem | By Gene Thorp, The Washington Post - Jan. 7, 2009