BBC NEWS | Middle East | Gaza clashes spark 'major crisis'
The Gaza Strip faces a "a full-blown humanitarian crisis", the International Committee of the Red Cross (ICRC) says.
The ICRC's head of operations for Gaza, Pierre Kraehenbuhl, told the BBC that life was becoming intolerable in Gaza after 10 days of conflict.
Clashes between Israeli forces and Palestinian gunmen continue as Israel attempts to end militant rocket fire.
At least 12 Palestinians were killed in an Israeli strike on UN-run school in in Gaza, medical officials said.
At least 110 people have died since the ground assault began on Saturday, medical officials say.
More than 560 Palestinians have been killed since Israel moved to end rocket attacks from Gaza 11 days ago, Palestinian medical officials say. The UN says at least 25% of those are civilians.
At least 30 Palestinians were killed on Tuesday, while four Israeli soldiers were killed by fire from one of their own tanks.
Israel says it has killed 130 Hamas fighters and has denied claims that Hamas has killed 10 of its soldiers.
Israel says its offensive is stopping militants firing rockets, but at least five missiles hit southern Israel on Tuesday, with one reaching the town of Gedera, about 40km (25 miles) from the Gaza Strip.