Iraqi officials say a wave of bombings in predominantly Shiite neighborhoods have killed at least seven people in the capital, Baghdad, and wounded over 30.

They say improvised explosive devices killed three people and wounded 10 at a popular market in the Shaab neighborhood in northern Baghdad. Another two explosions at traders' markets in the Topchi and Zataria areas killed four and wounded 16. A fourth bomb, planted in a microbus in the poorer Sadr City district, caused no deaths but wounded six.

The attacks come just a day after an Islamic State suicide bomber targeted an aid station for Shiite pilgrims, killing at least seven and wounding more than 20. No one claimed immediate responsibility for Sunday's bombings, but the Sunni extremist group often targets Iraq's Shiite majority, which it views as apostates deserving of death. Attacks in the capital have been rare since last summer.

The officials — police and hospital authorities — spoke on condition of anonymity because they weren't authorized to brief reporters.