(CBC) Alleged terror plot thwarted by arrests in Ontario, Quebec

Canadian police and intelligence agencies will announce later today they have thwarted a plot to carry out a major terrorist attack, arresting suspects in Ontario and Quebec, CBC News has learned.

Highly placed sources tell CBC News the alleged plotters have been under surveillance for more than a year in Quebec and southern Ontario.

The investigation was part of a cross-border operation involving Canadian law enforcement agencies, the FBI and the U.S. Department of Homeland Security.

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