Five car bombs killed 26 people in mostly Shi'ite Muslim neighborhoods in Baghdad on Saturday, police and medics said.
The first explosion, a suicide car bombing, killed seven people at a police checkpoint in the Abu Dsheer district in the south of the capital, the sources said.
Four other car bombs killed a total of 19 people: one in the Bayaa district in southwestern Baghdad, one in the western district of Jihad and two in northern Baghdad's Kadhimiya, which boasts a major Shi'ite shrine.
The army and allied Shi'ite militia are trying to push back Sunni insurgents who swept through northern Iraq last month to within 70 km (45 miles) of Baghdad.
Militants fought off an army offensive to retake the northern city of Tikrit on Tuesday. The army was forced to pull back south of the city on the banks of the Tigris.