By CNN National Security Analyst Peter Bergen
Editor's note: Peter Bergen is CNN's national security analyst, the author of "Manhunt: The Ten-Year Search for bin Laden - From 9/11 to Abbottabad" and a director at the New America Foundation.
The news that Canadian law enforcement on Monday arrested two men accused of planning to derail a passenger train in the Toronto area has attracted much attention, in part, because the plotters are also charged with "receiving support from al Qaeda elements in Iran."
By Paula Newton reporting from Ottawa, Canada
U.S. Defense Secretary Leon Panetta arrives in the Canadian capital Monday, where he is expected to announce new measures to support the fight against narcotics in the United States, Canada and Mexico.
He is attending a two-day meeting in Ottawa with Canadian and Mexican defense leaders. FULL POST