A wave of bombings and shootings across Iraq killed at least 32 people and wounded dozens more on Thursday, security officials said.

Most of the violence was centred in Baghdad, where attacks killed 22 people, an interior ministry official said.

A car bomb in the Shiite shrine district of Kadhimiya in north Baghdad killed six people and wounded 15, the official said.

In Adhamiyah, across the Tigris river, gunmen attacked a police checkpoint, killing six people and wounded three.

A car bomb exploded in the Karrada district of central Baghdad near a police checkpoint, killing one person and wounding 11, while another car bomb exploded in the same area about 30 minutes later, killing another person and wounding six.

And two roadside bombs and an attack by unknown gunmen against a police checkpoint killed two people and wounded nine in Umm al-Mualaf in southwest Baghdad.

And in Dura in south Baghdad, a roadside bomb killed two people and wounded 10.

Two roadside bombs exploded near a restaurant in Abu Shir, also in south Baghdad, killing two people and wounding 10.

A car bomb in Mansur in west Baghdad killed two people and wounded five.

And a roadside bomb wounded five people in Taji to the north of Baghdad.

In Diyala province, north of the capital, two car bombs exploded in the provincial capital Baquba, killing three people and wounding eight, while a roadside bomb killed one person, a police major said.

Gunmen also attacked a house west of Baquba, killing two people and wounding a third, while a roadside bomb east of Baquba wounded a man and his wife.

And a car bomb in the town of Dujail killed one person and wounded three at about 8:00 am (0500 GMT), the officer said.

In Salaheddin province further north, another car bomb exploded in the refinery town of Baiji near its courthouse at about 7:00 am (0400 GMT), killing three people and wounding five, a police colonel said.