I did not know about this story until I read this article either but "forgetting " about an attack on your own citizens is not normal. what are the victims families supposed to think? a disgrace. you drop the investigation only if there are no elements to carry it on. that is called justice. Iran involvmnent or not, I don't know either and have no opinion about this. Only an investigation can determine it. what is clear is that whoever did this shoudl be punished. can you imagine the horrible injustice you would feel if your govt decided to do such thing after your family lives such a tragedy? it is deeply wrong at many levels.
Pakistan air strikes against Taliban kill at least 25 (Reuters)