Secretary of State Marco Rubio says the U.S. is revoking all visas held by South Sudanese nationals, in response to the government of South Sudan not accepting citizens recently removed from the U.S. The U.S. will also stop issuing visas for South Sudanese passport holders. A number of South Sudanese citizens are currently in the U.S. under temporary protected status, but this is set to expire on May 3.

This comes as many fear South Sudan may be on the cusp of a new civil war as a power-sharing deal between government rivals recently collapsed and First Vice President Riek Machar remains under house arrest.