BAGHDAD — A suicide bomber on a bicycle killed 28 Iraqi policemen doing their morning exercises at their base north of Baghdad on Monday, police said, in one of the deadliest strikes on security forces in months.

The bomber entered the base in the volatile Diyala province and blew himself up amidst members of a rapid reaction force, said Major-General Ghanim al-Quraishi, the Diyala police chief.

A shopkeeper whose store is close to the base told Reuters he had seen a man riding a bicycle slip through a gap in the concrete wall surrounding the compound and heard a huge blast seconds later that threw a cloud of dust into the air.

“I saw many bodies covered in blood. Some were dying, some had arms and legs blown off,” said store-owner Ali Shahine.

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