Syed Mohamad was celebrating a key date in the Muslim Shiite calendar in secret when officials burst in and detained him, one of several raids in Malaysia that have set the long-persecuted community on edge.Dozens of Shiites have been rounded up recently in the Sunni Muslim-majority country, including several foreigners, fuelling fears that religious authorities are stepping up a crackdown on adherents of the minority sect.Around the world, Shiite Muslims – who are far outnumbered by Sunnis,