(CNN) -- The Royal Canadian Mounted Police are expected to announce Monday afternoon that Canadian law enforcement officials have "thwarted a plot to carry out a major terrorist attack, arresting suspects in Ontario and Quebec," the Canadian Broadcast Corp. reported.
The CBC, which is a CNN affiliate, quoted "highly placed sources" as saying the suspects were under surveillance for more than a year.
No connection exists between the disrupted plot in Canada and the Boston Marathon bombings, U.S. government sources told CNN's Carol Cratty.
The CBC reported that the investigation was "part of a cross-border operation involving Canadian law enforcement agencies, the FBI and the U.S. Department of Homeland Security."
An official with the Royal Canadian Mounted Police told CNN's Paula Newton on Monday an alleged terror plot that has been uncovered intended to target "transport links" but would not provide further details.
CNN's Carol Cratty contributed to this report.
Posted: 2:46 PM - April 22, 2013