Police officials say the deadliest attack, a bombing on a commercial street in the mainly Shiite Shula district on tonight, killed four people and wounded 11.
A bomb blast near a bus stop elsewhere in the city killed two people and wounded nine others, and in a third attack, gunmen on a motorbike opened fire on a barber shop, killing two people and wounding three.
Medics in nearby hospitals confirmed the casualty figures. All officials spoke on condition of anonymity because they were not authorized to speak to the media.