This is the first I've heard of it, but I have been reading the various news reports. I don't know how much is true, but supposedly as many as 500 lawyers participated, and 250 have been charged with *treason*. The government is seeking maximum punishment.
I'm trying the figure out the logistics of conducting 250 hangings. (the only legal method of capital punishment in Pakistan) It would have been a lot easier to shoot them during the riot.