Coordinated blasts have killed at least 25 people in the heart of Baghdad.

No one immediately claimed responsibility for the explosions near the heavily fortified Green Zone, where several Western embassies are located.

Police said two car bombs exploded in the Alawi district, one of them near the Justice Ministry building, before a suicide car bomber blew himself up near an Interior Ministry office.

A suicide bomber then walked into the Justice Ministry and militants attacked the building, clashing with Iraqi security forces, who eventually regained control.

Among the dead were at least 7 policemen and 15 civilians, police and medics said. Three militants were also killed. At least 50 people were wounded.

Iraq's power-sharing government has been all but paralysed since US troops left more than a year ago and Prime Minister Nuri al-Maliki, a Shia, is facing protests in the country's Sunni heartland, which shares a porous border with Syria.