The UN's agency for Palestinian refugees on Monday appealed for emergency funds to provide aid to nearly half a million Palestinians affected by the war in Syria.
Damascus relies on water from besieged rebel-held Wadi Barada, but either sabotage or regime bombing has stopped water flowing to Syria's capital.
The Israeli military has targeted Syrian militants in the occupied Golan Heights for the second time in 24 hours, warning of a 'new threat' by IS.
Israel has claimed to have killed a number of gunmen belonging to the Yarmouk Martyrs Brigade in the Golan Heights.
The UN Palestinian refugee agency fears beseiged Khan al-Sheikh camp near Damascus risks becoming "another Yarmouk" as the civilian death toll continues to rise
Blog: A London-based group is on a mission to promote Arab arts and culture, transforming the narrative surrounding the Middle East, writes Fardous Bahbouh.
Aeham Ahmad made headlines last year with the music he brought to under-siege Yarmouk camp. He tells his story as the UN summit addresses a record refugee crisis.
In-depth: Palestinian faction Fatah, which dominates the PLO, and Lebanese security have put years of animosity behind them, and started to work together on security in Lebanon.
Israel has struck targets in Syria after fire hit the occupied Golan Heights as similar exchanges of fire become more frequent.
The Israeli air force on Monday targeted a Syrian military position in Golan heights, reportedly in response to stray fire from the area.