Authorities in Iraq say at least 21 people have been killed in bombings around the capital, Baghdad.

Officials say the deadliest blast happened Thursday at a secondhand motorcycle market in Baghdad's sprawling eastern Sadr City district. They say the bomb appears to have been placed on a motorcycle at the market.

Officials say the blast killed 12 people and wounded at least 25.

Also in Sadr City, officials say a bomb attached to a minibus exploded, killing five civilians and wounding 14. Meanwhile, officials say another bomb on a minibus killed four and wounded 11 in the northern Shaab neighborhood.

A police officer and two medical officials confirmed casualty figures from the attacks. They spoke on condition of anonymity as they weren't authorized to speak to journalists.