An Air France flight from Paris to Detroit was diverted to Montreal Wednesday due to U.S. entry restrictions linked to the Ebola outbreak in multiple African nations, authorities confirmed. One of the passengers originated from the Democratic Republic of Congo (DRC).

U.S. Customs and Border Protection stated the passenger boarded “in error” on a flight bound for the United States. CBP emphasized the individual “should not have boarded the plane” because of entry restrictions designed to mitigate Ebola virus transmission risks. The agency did not specify when the person last traveled to the DRC.

Air France confirmed the diversion occurred “at the request of U.S. authorities,” noting there was “no medical emergency on board.” The flight, Flight 378, landed at Montreal Trudeau International Airport at 5:15 p.m. ET according to FlightAware tracking data.

The Centers for Disease Control and Prevention (CDC) implemented a temporary entry ban Monday for travelers who have been in DRC, Uganda, or South Sudan within the past 21 days. The order, effective for 30 days, aims to address the “serious risk of introduction” of Ebola disease into the United States while enabling public health assessments and response planning.

The CDC reported that the Bundibugyo virus strain causing the outbreak is immune to vaccines and antibodies developed for the more common Ebola variant. It has a mortality rate ranging from 25% to 50%, with treatment limited to supportive care.

World Health Organization Director-General Tedros Adhanom Ghebreyesus warned Wednesday that while the risk of regional spread in Congo and Uganda remains high, the global transmission threat is currently low despite over 130 deaths. He noted nearly 600 suspected cases and 139 suspected fatalities linked to the outbreak.