The Foreign, Commonwealth & Development Office says the attacks could be random, including in places visited by foreigners.

A department of the British government is warning potential travellers to Canada that there’s a high probability terrorists will try to conduct an attack in Canada.

“Terrorists are very likely to try to carry out attacks in Canada,” says the Foreign, Commonwealth & Development Office (FCDO) in a travel advice notice. It adds there’s a “high threat of terrorist attack globally affecting UK interests and British nationals.”
The department says that attacks could be “indiscriminate, including in places visited by foreigners.”