The U.S. State Department will now require all U.S. citizens and legal residents traveling back to the United States from three African countries experiencing an Ebola outbreak must enter the country through Washington, D.C., for an enhanced security screening. EPA-EFE/Stringer

May 21 (UPI) -- Americans traveling back to the United States who have recently been in Democratic Republic of the Congo, Uganda or South Sudan will be required to enter the country through Washington, D.C.

Citizens and lawful permanent residents who have been in any of the countries in the last 21 days will be required to fly to Washington Dulles International Airport for enhanced health screenings before continuing on to their final destination, the U.S. Department of State announced.

The announcement follows an Air France flight bound for the United States on Wednesday afternoon being redirected to Montreal Trudeau International Airport after a passenger on board was determined to be from the DRC.

The U.S. Centers for Disease Control and Prevention on Monday already had blocked non-U.S. passport holders from entering the United States if they had been to any of the three African nations in the last 21 days.