A suicide bomber in a car killed at least four people and wounded 17 more when he detonated explosives outside Iraq's interior ministry in Baghdad, police and hospital sources said on Monday.

The blast followed Thursday's wave of explosions that killed at least 72 people in Baghdad in the first such attacks since a crisis erupted between Iraq's Shi'ite-led government and Sunni rivals days after the withdrawal of the last U.S. troops.

(Reporting by Kareem Raheem; Writing by Serena Chaudhry; Editing by Patrick Markey and Michael Roddy)