The death toll, following a week of Israeli airstrikes in Gaza, has risen to more than 170 people.
Israel launched operation 'Protective Edge' seven days ago, in response to rocket fire from Hamas militants.
The United Nations says at least 17,000 people have sought refuge in its shelters in Gaza, following Israeli warnings to evacuate.
The European Union is joining the international calls for an immediate ceasefire, while Arab foreign ministers are due to meet in Egypt today to discuss the crisis.
Our News Correspondent Fergal O'Brien reports:
