Most of the 2.3 million people in the Gaza Strip have no electricity and no water. And, with hundreds of Israeli strikes raining down on their tiny enclave, they have nowhere to run.

The Palestinian territory, one of the most crowded places on Earth, has been under siege since Saturday in a near-constant bombardment that Gazan health officials say has killed more than 1,000 people. The blitz is retaliation for a devastating attack on Israel, by Gaza's ruling group Hamas, which the Israeli military says killed more than 1,200 people.

Gaza's sole power station, which had been working intermittently for days, cut out on Wednesday after running out of fuel. Without power, water can't be pumped into houses. At night there's nearly total darkness punctuated by fireballs and the pin-pricks of light from phones used as flashlights.