The bomb blast that killed at least 31 people in Iraq's capital Baghdad today struck a secondhand market in the eastern Sadr City district.
A motorcycle bomb had been slipped in among the other bikes on display, officials said.
Meanwhile, two other bombs struck across the capital, targeting minibuses transporting labourers at the end of the workday.
Nine people were killed and 25 injured in the two minibus attacks, authorities said, speaking on the condition of anonymity.
No group immediately claimed responsibility for the attacks.