Israel's army has begun flooding Hamas's network of tunnels as intense fighting rages in Gaza, with the UN warning of the potential "collapse of the humanitarian system" in the territory after a funding row hit its Palestinian aid agency.
The epicentre of the fighting in recent weeks has been Khan Yunis, southern Gaza's main city, where vast areas have been reduced to a muddy wasteland of bombed-out buildings, and where an AFP journalist witnessed people leaving town on Tuesday as explosions sounded nearby.
