The Trump administration on Monday said it is blocking American citizens in the Democratic Republic of Congo or those who have recently left from traveling to ​the U.S. on commercial flights, according to a White House official, placing them on a “do-not-board” list ​until they have spent at least 21 days in a third ​country.

The new restrictions come amid a widening Ebola ⁠outbreak, which has spread to a number of provinces within Congo. Earlier on Monday, U.S. Secretary of Health and Human Services Robert F. Kennedy Jr. signed an order citing increased Ebola ​risks, including the ​spread of the ⁠virus to just hours outside of Congo’s capital, Kinshasa.

Full report: US to block citizens in Congo from immediate travel home, citing Ebola.