The attack led to hundreds of Palestinians fleeing into Gaza City, though the Israeli military said it had warned citizens in the town to evacuate days ago.
A cease-fire, requested by the International Committee of the Red Cross, took place for two hours Sunday afternoon so emergency officials could take care of the dead and injured.
Thirteen Israeli soldiers died overnight after Hamas said it lured a tank into a field rigged with improvised explosive devices.
Since last night, 13 soldiers from the IDF's Golani Brigade were killed while fighting Hamas terrorists in Gaza.— IDF (@IDFSpokesperson) July 20, 2014
More than 410 people have died in Gaza, Palestinian officials said.
Meanwhile, Israeli Prime Minister Benjamin Netanyahu said he wants Gaza to be demilitarized in the future.
"These people are the worst terrorists -- genocidal terrorists. They call for the destruction of Israel and they call for the killing of every Jew, wherever they can find them," he said of Hamas and Islamic Jihad.
"We're doing everything we can not to harm the people of Gaza," he added. "Hamas is doing everything they can to make sure the people of Gaza suffer."