The federal government says no Canadians were among the seven people killed when a bus carrying tourists and local travellers crashed in far eastern Cuba.
In addition to the dead, three Cubans and two foreigners - 42-year-old Spaniard Felicita Hurtado and French woman Marline Alphonse, 63 - were said to be in a serious condition.
The coach overturned while driving on the road linking the city of Baracoa, near Cuba's eastern tip, to the capital Havana.
Meanwhile, five of the injured were said to be in critical condition in hospital.
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According to Radio Guantanamo, two Canadians were on the bus - a 56-year-old man and a 54-year-old man, however, the extent of their injuries is not yet known. Previous year in all of Cuba there were over 11,000 vehicle accidents on their poorly-conditioned highways.
The UK Foreign Office was "seeking information from the Cuban authorities" and that it was "ready to assist any British people who require our help", a spokesperson told the BBC.
Thursday's wreck was the fourth major bus accident in a month.
Traffic accidents are common in Cuba and have resulted in some 4,400 deaths since 2012, according to official data.