A South Korean flight attendant who has been diagnosed with the novel coronavirus may have serviced trips between Seoul and Los Angeles last week, according to several South Korean media outlets.

South Korea’s Center for Disease Control said Wednesday local time that a female flight attendant who serviced a flight Feb. 15 from Tel Aviv to Seoul had tested positive for the virus. On board the flight was a church group returning from a pilgrimage to Israel; 30 other infections have been connected to the group so far, according to local authorities.