The blast comes in the wake of Iraq's parliamentary election.

In Anbar, a Sunni Muslim dominated province, where 58 per cent of the vote has been counted so far, the secular Iraqiya coalition is leading the vote.

Fallujah was once a hotbed of the Sunni insurgency agaisnt the US-led invasion of Iraq, but security there has improved in recent years.

Since 2006, Sunni tribesmen and former anti-US fighters have joined forces with the US military against al-Qaeda, greatly reducing the groups' presence in the area.