Egypt calls for new talks and a ceasefire between Israel and the Palestinians, as both sides continue to exchange fire.
An Israeli air strike toppled a building more than12-story-high in Gaza on Saturday.
The Israeli military said it was targeting a Hamas operations room in the building.
According to Gaza police, a warning missile was fired and some residents evacuated in time, but 22 people were wounded in the attack.
Meanwhile, Hamas fired more than 100 rockets and mortar shells into Israel, forcing Israelis to flee border areas.
The latest spate of violence follows the collapse last week of a previous ceasefire brokered by Egypt.
More than 2-thousand Palestinians -- most of them civilians -- and over 65 Israelis -- most of them soldiers -- have been killed in recent weeks.