Up to 19 US Cuba-based embassy staff report health problems

A suspected “acoustic” or “sonic” attack on US embassy staff in Cuba was reported after the union representing diplomatic staff said some victims suffered mild brain injuries and permanent hearing loss.

Cuba has denied any involvement in the attacks and says it is investigating the reports.

"Diagnoses include mild traumatic brain injury and permanent hearing loss, with such additional symptoms as loss of balance, severe headaches, cognitive disruption and brain swelling," the union said.

The symptoms appeared in August the US expelled two Cuban diplomats from Washington.