Ban Ki-moon told reporters that "a refugee camp is beginning to resemble a death camp" for its estimated 18,000 residents.

Ban Ki-moon told reporters that “a refugee camp is beginning to resemble a death camp” for its estimated 18,000 residents.

The Yarmouk Palestinian refugee camp near Damascus that has been overrun by Islamic State fighters is “the deepest circle of hell” in Syria’s four-year horror, the UN secretary-general says.

Ban Ki-moon told reporters that “a refugee camp is beginning to resemble a death camp” for its estimated 18,000 residents.

He warns that the armed fighters inside the camp and Syrian government forces outside it are a double-edged sword for the thousands trapped.

“We simply cannot stand by and watch a massacre unfold,” Mr Ban says.

IS fighters overran much of the Yarmouk camp last week.

The secretary-general is demanding an end to the fighting, access for humanitarian aid and safe passage for people who wish to flee.