challenge to the asset regime. nadim houry in beirut. thank you for your time. more on the top story in pakistan and the suicide attack where 80 people were killed in the region in northwest pakistan as the first major attack in that country since osama bin laden was killed ten days ago. cnn s nick payton walsh joins us with more on that. nick, we understand that the pakistani taliban have claimed responsibility. they sayt s in retaliation for the killing of s oles. but i m curious to see why would they be targeting pakistan yis in this? well, i think it s clear in the pakistani taliban s mind, the security forces here are working with them in the fight against militants here. in their minds a target to take retaliation. a little bit of detail about how that happened. a complex attack. two suicide bombers apparently on motorcycles taking aim at buses or graduates from this