Israel troop build-up intensifies amid growing humanitarian crisis

Israel continues to prepare for the next stage of its conflict against Hamas, with troop build-up intensifying ahead of an expected ground invasion of Gaza. The UN says half a million people have now been displaced – after Israel told civilians living in the northern part of the Gaza Strip to evacuate.Meanwhile the border between Egypt and Gaza remains closed, despite international efforts to allow Palestinians to leave the territory into the neighboring country. Sarah Coates in Tel Aviv says there are growing hopes that aid may get into Gaza.