Vice President Kamala Harris pushed ahead with a trip to Vietnam on Tuesday after delaying the visit over concerns due to a health incident potentially related to the mysterious Havana syndrome.

Harris arrived in the Southeast Asian country's capital after a three-hour delay in Singapore that the US government blamed on reports that someone in Hanoi may have been targeted by the Havana syndrome, a condition of unknown origin with symptoms including dizziness, nausea, migraines and memory lapses.