For those interested, I found another article on this topic. The Pakistan army believes the attack was on purpose, that more are planned and that they plan to deploy air defense systems along the border. Some comments are made by low level officers where plausible deniability exists by higher ups. This comment was made by Major General Ashfaq Nadeem, director general of military operations to a Senate committee on defense. The other articles were from the BBC, this one from Canadian media.
http://cnews.canoe.ca/CNEWS/World/2011/12/09/19100636-reuters.html