New York City was apparently the target of a cross-border terrorist plot that was rolled up in Canada today.

Canadian police and intelligence agencies will announce later today they have thwarted a plot to carry out a major terrorist attack, arresting two suspects in Montreal and Toronto, 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 two men are expected to appear in court tomorrow.

This plot had no apparent connection to the Boston bombing.

Update: The two men arrested are 25 and 30 years old. They intended to attack a passenger train in Toronto. They reportedly received training and support from al Qaeda.

More: But…al Qaeda has been decimated!