On Friday before the break of dawn, Israeli aircraft artillery struck about 40 targets all over Gaza, the military said, according to the Associated Press.

The attacks in Gaza continue, following yesterdays shelling of the U.N. headquarters in the Gaza by Israeli soldiers. Food was set ablaze and some 700 people seeking refuge there had to flee.

Visiting UN chief to Israel strongly rebuked this act and called it an outrage.

Israel's Defense Minister Ehud Barack said the U.N. attack was a grave error and apologized for it, according to the Associated Press.

The city of Gaza was in total chaos, terrified residents were fleeing for shelter, many not knowing where to go.

Another Israeli bombardment killed Hamas' head of security.

After nightfall on Thursday, shells landed near Gaza City's Quds Hospital, where many families had sought refuge, and the building caught fire, forcing staff to evacuate hundreds of people. According to a hospital medic, some patients were pushed down the street on gurneys; a few held white flags.

Since the start of the offensive on December 27, the death toll has risen to 1,100 Palestinians and 13 Israelis.