Israeli officials say Hezbollah also provides Hamas with training and logistical support. They add that Hamas has also adopted other Hezbollah tactics, operating in civilian areas and in some cases storing weapons in homes, creating similar quandaries for the army that it faced in its war in Lebanon in 2006.

Soon after the forces left northern Gaza on Monday, two more of the imported rockets struck Ashkelon, an Israeli coastal city of 120,000 people about 10 miles north of the strip. One rocket hit an apartment block, causing damage but no serious injuries.

Hamas has claimed responsibility for most of the rocket fire. Hamas took over Gaza last June after routing forces loyal to President Mahmoud Abbas of Fatah.

Mr. Abbas, who is based in the West Bank, suspended peace talks with Israel as the death toll rose in Gaza, and on Monday he called on all sides to agree to a cease-fire and to allow him to act as a mediator, a day before Secretary of State Condoleezza Rice was expected to arrive in the region for talks.

There was a second day of unrest in the West Bank on Monday, with Palestinians protesting the Israeli actions in Gaza and throwing stones at soldiers and Israeli cars in various locations. An Israeli settler shot and killed a 17-year-old Palestinian on a road west of Ramallah. According to Israel Radio, the settler said he had gone out for a walk and was confronted by a group of Palestinians, some masked, who threw stones.

In what was apparently a bid to remain relevant in Gaza, and in an echo of the actions of the Lebanese government in southern Beirut after the war in 2006, Mr. Abbas also instructed his government to allocate $5 million to compensate Gaza residents whose properties were damaged in the Israeli campaign.

Image Israeli soldiers, above, approached Palestinian youths on Monday in Bethlehem, in the West Bank, after Palestinians protested Israeli military attacks in the Gaza Strip. Credit... Kevin Frayer/Associated Press

Israel says its ground and air forces have been aiming only at rocket squads and weapons storage and production facilities in Gaza. Israel’s army chief of staff, Lt. Gen. Gabi Ashkenazi, and its chief of military intelligence, Maj. Gen. Amos Yadlin, described 90 percent of those killed in Gaza in the last few days as terrorists.