Israeli airstrikes hit Gaza for a 4th day Killing a 15 Year old Boy

Gaza City (CNN) -- Fresh airstrikes early Monday in Gaza led to the death of a 15-year-old boy, the fourth civilian killed in four days of bombing by the Israeli military, Palestinian medical and security sources said.

Israel said the airstrikes targeted militant rocket launching sites across the Palestinian territory.

The bombing killed three people, Palestinian officials said: the teen and two militants. Forty others were injured, they said.

On Sunday, a 13-year-old boy was killed as was a 60-year-old Palestinian man who was guarding a farm grove in Gaza City.

And on Saturday, a 51-year-old man was killed on the back of a motorcycle.

Defense Minister Ehud Barak defended Israel's response. Read More