There are now 21 reported cases, up from 19 on Sept. 1, State Department spokeswoman Heather Nauert said.
A U.S. investigation is ongoing, Nauert said.
The Trump administration has not blamed the Cuban government for what the union representing Foreign Service officers called “sonic harassment attacks” dating to late 2016.
Cuba has denied wrongdoing in the mysterious events. Victims have been diagnosed with mild traumatic brain injuries, hearing loss and other neurological and physical ailments, the union said. …