Iraqi officials have raised the death toll to 28 from attacks the previous day that shook Baghdad and towns north of the capital.

Two police officers said Wednesday that the deadliest of Tuesday's attacks struck the southern Dora neighborhood, where back-to-back bombings killed nine people and wounded 10. Bombs in the eastern neighborhood of Sadr City and in the northern Shaab area killed 12 and wounded 33.

Blasts and shootings in Tarmiyah and Mosul killed seven other people.

Two medical officials confirmed the casualty figures. All spoke on condition of anonymity because they are not authorized to talk to the media.

A relentless wave of violence has edged Iraq closer to all-out internal warfare. On Monday, attacks killed more than 70 people and more than 450 have died this month.