On Friday, at least 305 Egyptians were killed by terrorists who detonated a bomb in a crowded Sufi mosque, then sprayed worshipers with bullets as they fled. It was deadliest terror attack in the country's modern history. Daisy Khan, founder and executive director of the Women’s Islamic Initiative in Spirituality and Equality (WISE), talks about the Sufi branch of Islam and why its adherents are targeted by ISIS.