The story is at MSNBC. among other places. Apparently Bhutto has decided not to deal with Musharaff for the present. I am surprised that Musharaff ever let her fly back in to Pakistan twice. He must have been counting on some sort of deal with her but her decision to join demonstrations has quashed that for now. Bhutto tried to leave her house earlier but was blocked.
The US is a strong backer of Bhutto because she is keen on attacking the tribal zones. I would not be surprised if she is assasinated soon not only the Islamists but many within the military and intelligence service oppose her.