yes..Banu Quraya was helping the Mushrik of Mecca to carry out secret night attack on muslims despite of signing peace treaty with muslims...they were providing them all the military and strategic information to the mushriks as well and trying to create unrest and dissatisfaction amongst muslims by spreading rumor.If that attack has been successful, the whole of the muslims would have died in one sweep..( a good and energizing thought for you..hai naa..but unfortunately for you and fortunately for me it did not happen ) So they muslims attacked them...( it was not genocide )..they closed themselves in their fort/city, and then sent some people for "negotiations" and then they asked prophet to make judge a person who belongs to their tribe ( banu quraya )..and prophet granted them their wish and asked them to choose by themselves..so "they selected" a moslim convert who earlier belog to banu quraya..and he gave verdict as all men who could fight should be beheaded..women, children, old and ill peoples should be spared..... so beta VIVEK...make inquiries before eating any shi*t that has been fed to you and shi*ting it here besides even if islam or mohammad were not there the arabs would have killed that tribe for traitory...that was the rule of time there..so don't judge it from present days culture and standards...speaking of genocide..what is your opinion about Muslim genocide in Kashmir by Indian Military and in Gujrat by BJP?..we have them on tape on tehelka..what say???