Have Pakistani Nuclear Facilities Already Been Attacked?

In a little-noticed article published last month in a West Point counterterrorism journal, a British academic pointed out that while the world waits for the kind of global public announcement of doomsday that would come from a Bond villain, Islamist militants in Pakistan have quietly launched at least three attacks in the past two years on military bases that may contain nuclear weapons.

That very comforting (yes, sarcasm here) paragraph is from The Lede at NY Times.
Now, this is a day after I read quite a few way too uncomfortable discussions in the new "AfPak Channel" in Foreign Policy.

Thanks! Now I can worry that much more about Pakistan.