What is Sufism and why does it bother some Muslims?

By: Anne-Marie Bissada



When a mosque in Egypt’s Sinai region was attacked by affiliates of the Islamic State armed group in November leaving over 300 people dead the attackers said they were targeting what they described as 'heretics of Islam', known to the wider world as Sufis.Who are the Sufis and why have they been singled-out by some other Muslims?