Also in Gaza, CNN saw a group of men drag the body of a man through streets from the back of a motorcycle. The men, who carried weapons, yelled in Arabic that he was a traitor and Israeli spy.
Gaza has endured a crippling economic embargo since Hamas won control of the territory from the Fatah-led Palestinian Authority after a landslide 2007 election that was followed by intra-Palestinian clashes.
Many Arab and Muslim nations view Hamas as the victim of Israeli aggression.
Diplomats hope to avoid a repeat of 2008-2009, when at least 1,400 people died when Israeli troops invaded Gaza after a similar spate of rocket attacks.