UN speaks about sheltering 100,000 refugees in Gaza

Gaza's health ministry says the Palestinian death toll from the two-week conflict has now passed 550, the majority of them civilians. 25 Israeli soldier and two Israeli civilians have been killed. The UN Relief and Works Agency operates shelters for Palestinian refugees in Gaza and says the situation is an emergency. Scott Anderson is the Gaza Field Office's Deputy Director of Operations, and he explains how the situation has escalated in recent days