(CNN) The Peace Corps is suspending its global operations and evacuating all volunteers as concerns mount about the coronavirus pandemic, the organization said Sunday.

"As COVID-19 continues to spread and international travel becomes more and more challenging by the day, we are acting now to safeguard your well-being and prevent a situation where Volunteers are unable to leave their host countries," director Jody K. Olsen said in a letter to volunteers.

Olsen said volunteers had already been evacuated from China and Mongolia.

"Unfortunately, it has become clear in the last 48 hours that numerous posts must follow suit," she said.

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