The explosion took place in a garage near a football stadium and a café, when an explosive device attached to a vehicle detonated, leading to another explosion of a gas tanker that was close by, the security sources said.
Most of the victims were amateurs playing football in their neighbourhood stadium.
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A military statement said a gas tanker exploded in a garage in East Baghdad causing a number of casualties and security forces are investigating the cause of the explosion, without giving further details.