Palestinians hold up slogans against Israels blockade on the Gaza Strip during a demonstration at Erez crossing, northern Gaza, on November 18, 2008. The top United Nations human rights official today called on Israel to immediately lift its blockade of the Gaza Strip which she said violates international law. The UN resumed food distribution to half of Gaza's population earlier today but warned aid supplies would soon run out unless Israel eases its crippling blockade. Photo by Ashraf Amra

Palestinians hold up slogans against Israels blockade on the Gaza Strip during a demonstration at Erez crossing, northern Gaza, on November 18, 2008. The top United Nations human rights official today called on Israel to immediately lift its blockade of the Gaza Strip which she said violates international law. The UN resumed food distribution to half of Gaza's population earlier today but warned aid supplies would soon run out unless Israel eases its crippling blockade. Photo by Ashraf Amra

Palestinian women, supporters of Hamas Islamist movement, attend a protest in Gaza City on November 18, 2008 against what the Islamists say is the arrest of hundreds of its members by Palestinian authorities in the West Bank. Hamas said last week that the Palestinian Authority is holding more than 600 of its members, adding that it was willing to hold reconciliation talks with Palestinian president Mahmud Abbas as soon as they are released photo by Ashraf Amra / FLASH90

A medical care to a newborn baby laying in an incubator at the al-Shifa hospital in Gaza City on November 18, 2008. The Hamas-run Health Ministry in the Gaza Strip has said that due to power outages, the main hospitals in Gaza were depending on generators for electricity and warned that any failure to those generators could paralyze critical departments of the hospital and put patients? life in danger. The World Health Organization reported that hospitals in Gaza remain operational in spite of the power cuts. The hospitals currently have enough fuel to operate their emergency generators. However, there is growing fear in hospitals and clinics regarding increased dependency on the back-up generators to run medical services including surgical operations. These generators are in place for emergency use only and could fail any time Photo by Ashraf Amra / FLASH90