Millions of Shiite Muslims in Iran, Afghanistan, Pakistan and around the world on Friday commemorated Ashoura, a remembrance of the 7th-century martyrdom of the Prophet Muhammad's grandson, Hussein, that gave birth to their faith.

In Afghanistan, the Taliban cut mobile phone services in key cities holding commemorations for fear of militants targeting Shiites, whom Sunni extremists consider heretics. Security forces in neighboring Pakistan as well stood on high alert as the commemorations there have seen attacks in the past.