Millions of Muslim pilgrims are flocking to the Iraqi holy city of Karbalaa to commemorate the Arbaeen of Imam Hussein (P)-- the fortieth day after Imam’s holy martyrdom.

Millions of Muslim pilgrims are flocking to the Iraqi holy city of Karbalaa to commemorate the Arbaeen of Imam Hussein (P)-- the fortieth day after Imam’s holy martyrdom.

The Iraqi forces have taken strict security measures around Imam Hussein’s shrine to protect pilgrims against possible terrorist attacks ahead of the mourning rituals on Thursday when the religious event reaches its peak.