Arafat's own group apparently carried out this latest suicide bombing. He just threw away his advantage by driving Powell out. Arafat must go.
While I don't know if I believe it, there are many who apparently are close to the administration who think that this was the plan all along:
Give Arafat enough rope to hang himself and have Powell shrug his shoulders and say, "Hell, I tried. OK, Sharon, go to it."