The officials got symptoms including nausea, fatigue, and headaches, the same as US personnel in other countries, The Wall Street Journal reported.
CIA director William Burns called "Havana Syndrome," which up to 200 Americans have reported having symptoms of, "real" and "serious" during an interview.
Dozens of US officials in Vienna have experienced Havana syndrome symptoms since Joe Biden took office, making it the second biggest hotspot
The number of US personnel reporting Havana Syndrome symptoms is growing. One officer described his symptoms and fight for treatment.
The "Havana Syndrome" is a mysterious illness that has afflicted US staffers around the world. The cause remains unknown.
Military scientists plan to expose primates to pulsed microwave radiation to study any possible links to Havana Syndrome, The New Yorker reports.
Senators Jeanne Shaheen, Susan Collins, Mark Warner, and Marco Rubio introduced the "Havana Syndrome" legislation on Wednesday.
The second case occurred after the official walked through a White House gate. The official sought immediate medical treatment, according to CNN.
The US government is trying to figure out the cause of the strange episodes affecting US spies, diplomats, and even military personnel.