The blast happened in the run-up to Arbaeen, a Shia holy day.

BBC: Iraq: Bombings in Baghdad and Nasiriya kill scores

The trail extends, for the adventurous, into a five-day circuit along the Holy Ridge, a narrow craggy ridgeline with sheer drops of 1, 000m on both sides.

BBC: Hiking in the landslide capital of the world

The holy grail is a Day Zero attack, preventing something which has never been seen before.

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The latest trouble began after a procession through the church on Holy Cross Day - marking the discovery of the cross which some believe was used for the crucifixion.

BBC: NEWS | Middle East | Jerusalem clerics in punch-up row

The holy day commemorates the end of a 40-day mourning period for Imam Hussein, the grandson of the Prophet Mohammed and one of the most revered Shiite figures.

CNN: Women, children among 38 killed near Iraq festival

KARBALA, Iraq (CNN) -- Crowds of Shia Muslims Wednesday chanted and danced in the streets of this holy city on the final day of a pilgrimage long suppressed under Saddam Hussein's rule.

CNN: Pilgrims flood Karbala on final holy day

According to the Holy See's constitution, a 15-20 day waiting period must be observed after the papacy becomes vacant.

BBC: Vatican may bring forward conclave for next pope

Apple's appearance comes just a day after the same panel branded Apple's complex structure the "Holy Grail of tax avoidance".

BBC: Apple's Tim Cook defends tax strategy in Senate