According to rahyafte(the missionaries and converts website):
Source: http://www.ibtimes.co.uk
Millions of pilgrims have gathered in Iraq’s holy city of Karbala to mark Arbaeen, a sacred Shia Muslim ritual. Arbaeen, also known as Chehlum, commemorates the end of the 40-day mourning period after the killing of Imam Hussein, the Prophet Muhammad’s grandson, in a battle in 680 AD.
According to rahyafte(the missionaries and converts website):
Source: http://www.ibtimes.co.uk