In a statement, the cell said that the explosion, which targeted the Maridi market was caused by an explosive device.
In an interview with Rudaw correspondent Halkawt Aziz from the site of the explosion, eyewitnesses accused the government of negligence in protecting them and blamed security forces for failing to prevent these explosions.
Maridi market is one of the more popular markets, crowded with vendors and customers with low income.
"I am from Sadr City and one of the October revolutionaries... Since 2003, politicians have controlled our country and destroyed it," an eyewitness told Aziz.
Baghdad experiences explosions from time to time, especially in poor, crowded neighborhoods. Earlier in April, a deadly car bombing in Sadr City killed and injuring 20 people and destroyed five vehicles. The Islamic State (ISIS) claimed responsibility for it.
