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pilgrims walking to Kerbala (in Iraq) to visit the shrine of imam Hussain on the Arbaeen (the occasion of the 40th day after his martyrdom).
millions of muslim shiah walk from all around Iraq and from all nationalities to the shrine of imam Hussain on the Arbaeen.
the pilgrimage takes tens of days for some of them.
the pilgrims are targets of bombing and killing by terrorists.