http://www.bbc.com/news/world-us-canada-40894444
Canada's foreign ministry is investigating after at least one of its diplomats stationed in Cuba was treated for hearing loss and headaches.
It comes a day after the US said its diplomats in Havana were experiencing strange physical symptoms.
Reports suggest the envoys could have been targeted by a covert sonic device that causes hearing loss.
Havana denies the allegation, but the US has removed two Cuban diplomats from Washington in retaliation.