Ottawa will remove families of diplomats posted at its embassy in Cuba as the cause of unusual health symptoms is still unknown, though information from medical specialists has raised concerns of a new type of brain injury, Canada said on Monday.

Canada is still investigating the cause of the symptoms that were first reported by Canadians connected to the Havana embassy in 2017 and have also affected U.S. diplomats in Cuba.

The symptoms, which include dizziness, headaches and nausea, have been found in 10 of the 27 Canadian personnel and family members that initially received medical testing, a senior government official said.