In Canada, 12 men and five youths have been rounded up in what has been described as one of the largest anti-terrorism operations ever undertaken in North America. More than 400 police officers took part in a series of raids on Saturday. The men have been accused of planning to carry out attacks in southern Ontario with bombs made from the fertilizer ammonium nitrate. It is unclear how much of the plot was actually a government sting operation. According to the Toronto Star, it was the Royal Canadian Mounted Police itself that delivered three tons of the potential bomb-making material to the group. Once the material was delivered, officials moved in and made the arrests.