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It looks as if the Ottawa Citizen was a bit loose in its language. Canada does not have an official travel advisory out on Costa Rica - but the Foreign Affairs website advises as follows:
Travellers should be alert to their surroundings near the ports of Limón and Puntarenas. In San José, high-risk areas for theft include the Coca Cola bus station, the inner downtown area and the public parks. Travellers should also be cautious in Tamarindo, Jaco, Quepos and Manuel Antonio on the Pacific coast; and in Puerto Viejo on the Atlantic coast.
It is not clear when this language was posted or if it was in response to a particular incident.
Please note that Tamarindo is where Michael Dixon was last seen, and Puerto Viejo is where an American was recently murdered while relaxing on the beach.