Canadian police have stepped in and made arrests which hopefully prevent major terrorist attacks in Canada or possibly the U.S. that might have been imminent. General press articles at the Toronto Star, the National Post, and the Washington Post. Riehl World View discusses the large amount of explosives held by the arrested Canadians, and how these arrests relate to two arrests in Atlanta GA. Counterterroism Blog points out the vast international links that this group had. See also fine write-up and references by Steve Schippert at ThreatsWatch.Org and Thomas Lifson at The American Thinker.
For a longer read regarding work by our police at home, see this piece in The New Yorker about the city's anti-terrorism work. Fascinating. Hat tip to Barbara O'Brien who saw this referenced in No More Mister Nice Blog.