U.S. Suspects Pakistan Link to Kabul Attack

It would be hard to prove, and no matter what evidence they can find the Pakistani Gov will deny it; its what they do.

Foxnews
U.S. officials are looking for evidence that directly links elements of Pakistan's powerful spy agency to this week's assault on the U.S. Embassy and coalition headquarters in Kabul, The Wall Street Journal reported Saturday.
The U.S. suspicions are a sign of just how rancorous relations have become between the two allies in the fight against Al Qaeda and the Taliban.
Suspicions are being partly fueled by growing concerns that deteriorating bilateral relations, and the withdrawal of troops from Afghanistan, may be pushing elements of Pakistan's Inter-Services Intelligence (ISI) spy agency to more closely embrace the Haqqani network, the Taliban faction blamed for this week's violence and a spate of attacks in and around Kabul.