COX’S BAZAR, Bangladesh (AP) — The U.N. said today that an “alarming number” of 270,000 Rohingya Muslims have fled violence in Myanmar by crossing into Bangladesh in the last two weeks.

The new figure confirmed by U.N. Refugee Agency spokeswoman Vivian Tan is much higher than the 164,000 the agency had previously estimated had arrived since Aug. 25.

“This is an alarming number,” Tan said. “The existing camps are full to the capacity. There is a lot of pressure on relief agencies to accommodate the rising numbers.”

The exodus from Myanmar’s northern Rakhine state began Aug. 25 after Rohingya insurgents attacked police posts. The military responded with what it called “clearance operations” to root out any fighters it said might be hiding in villages of Rakhine state.