The U.S. on Tuesday ordered the departure of family members of its government employees in Bolivia.

The State Department cited “ongoing political instability” in the South American country, saying the travel advisory has been raised to Level 4, or Do not Travel.

“The U.S. government has limited ability to provide emergency services to U.S. citizens in Bolivia,” said the department in a statement.

It added that domestic and international flights may be delayed or cancelled and road travel around and between cities is regularly impeded.

Read more: US government employees' families told to leave Bolivia