The Saturday morning attack on an open-air fruit and vegetable market killed at least 19 people and wounded another 40 while popular Shiite leader and cleric Muqtada al-Sadr led his supporters in a protest calling for government reforms.
A small contingent of Iraqi security forces personnel are battling an Islamic State onslaught at the Baiji oil refinery north of Baghdad.
The assault on a major refinery in the northern city of Baiji comes after reports claiming the Islamic State has abandoned three major oil fields elsewhere in Iraq.
"We were able to contain the strike and arrest deterioration," Maliki said. Meanwhile, ISIS-led gunmen attacked Iraq's biggest oil refinery.