The Islamic State has stepped up bombings in Iraq since last year. (Representative image) Photograph: (AFP)
The explosion, the deadliest in Baghdad so far this year, targeted a Shi'ite suburb in the city
A suicide bomber detonated a pick-up truck on Wednesday in Sadr City, a heavily populated poor Shi'ite suburb of Baghdad, killing at least 15 and wounding 50, security sources said.
The explosion, the deadliest in Baghdad so far this year, targeted a crowded street full of garages and used car dealers.
Islamic State has stepped up bombings in Iraq last year, in retaliation to a US-backed campaign that dislodged the hardline Sunni group from most Iraqi cities it took over in 2014.
The militants also control parts of neighbouring Syria.