The tens of thousands of Palestinians who burst out of Gaza into Egypt this week in search of food, fuel and medicine have temporarily broken the siege that had tightened like a noose around this teeming territory ever since Hamas took over the Gaza Strip last June.

Like the lid coming off a pressure cooker, the blown-up border fence has avoided a bigger explosion - for now. But Gaza's humanitarian disaster and conflict shows every sign it could escalate into war if it is not brought under control.