The investigation determined Deciding that the crash was caused Causation deliberately by the co-pilot , Andreas Lubitz , who had previously been treated Cure for suicidal tendencies and declared Expressing_publicly `` unfit to work '' by his doctor .

The events of the Second Fitna intensified Cause_change_of_strength sectarian tendencies in Islam and various doctrines were developed Coming_to_be within what would later become the Sunni and Shi ' a sects of Islam .