The United Nations has warned that the conditions in the Damascus neighborhood of Yarmouk, where tens of thousands of Palestinian "refugees" live, have become desperate.

"The fighting has been intense, and is taking place in the most densely populated areas of Yarmouk, with the use of heavy weapons, explosive devices and weapons of indiscriminate effect," said UNRWA spokesperson Chris Guinness.

He added that "Whatever supplies of food and water they had have long been exhausted. Civilians are enduring yet another extraordinary episode of deep trauma and abject suffering."