Mohammed Salem/ReutersGaza faced a crippling communications blackout on Thursday as internet and telephone services crumbled due to the lack of fuel for backup generators, Jawwal and Paltel, two Palestinian network providers, said. Israel has prevented almost all fuel from entering the region since the start of the war last month, claiming Hamas takes it for its weapons. This has led to UNRWA, the lead United Nations agency in Gaza for Palestinian refugees, to raise concerns that it would not be