Some interesting background here
Asia Times Online which suggests the attack was a response the arrest of Al-Queda sympathisers/infiltrators within the Pakistan Navy
It should have been the first of two articles - but the second seems not to have appeared. The author has since been murdered - some claim by the Pakistani Security Forces
heres the report of his death
Missing Pakistani journalist found dead
Begs the question: have they infiltrated far enough to be able to pinch a ship? Or an Orion?