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The bombing happened outside the town of Khalis in the north-east of Baghdad, Iraq.

A police officer at the scene described how most victims died inside their vehicles while waiting to enter the town.

"We still have charred bodies inside many vehicles including a minibus packed with women and children," he told Reuters.

(Image: TWITTER)

The initial death toll was at 14 but hospital sources said it was expected to rise given the extent of critical injuries.

On Sunday, another suicide bomb killed 21 people.

Earlier this month 292 people were killed in another suicide attack in central Baghdad, one of the largest attacks of its kind since the US-led invasion in 2003.

While only at the weekend a Syrian asylum seeker injured 12 after detonating a bomb at a music festival in Germany.

Iraqi Prime Minister Haider al-Abadi has come under pressure to improve security.

It comes after a suicide attack – claimed by ISIS – earlier this month killed 292 people in central Baghdad.

The ultra-hardline militants have lost much of the territory they seized in 2014 and Abadi has pledged to retake this year the northern city of Mosul, the group's de facto capital in Iraq.