The head of the medical charity Médecins Sans Frontières (MSF) said that Gaza faces a catastrophe extending far beyond a humanitarian crisis, describing the situation in the densely populated enclave as chaotic, Reuters reports.

“My people on the ground keep updating me on the situation, and I can tell you that it has gone far beyond the humanitarian crisis,” Christos Christou, international president of Doctors Without Borders, told reporters in Geneva.

“It is a humanitarian catastrophe. It is a chaotic situation, and I’m extremely worried that very soon people will be in a mode of just trying to survive, which will come with very severe consequences,” he said.

“The people have been asked to be squeezed in a very small area,” Christou said. “My teams on the ground keep saying to me that it is unbearable. It is unsustainable […] There is no safe place,” he said.

In an open letter to the UN Security Council published earlier this week, Christou implored the body to demand an end to Israeli attacks against Palestinian civilians and allow humanitarian aid to enter Gaza unimpeded.