Internet and telephone services in Gaza have collapsed due to lack of fuel, leaving the population cut off from each other and the outside world. This worsens the severe humanitarian crisis in southern Gaza, as Israeli airstrikes continue. The UN's World Food Program warns of the immediate possibility of starvation in Gaza as the food supply has broken down under Israel's seal and too little is coming from Egypt. The war, now in its sixth week, was triggered by Hamas' attack into southern Israel, resulting in over 1,200 deaths and the capture of 240 people. Israel has responded with an air campaign and ground invasion of northern Gaza.