Car bomb in Iraq kills 13, wounds 33 - sources
The blast set fire to about 30 cars at the busy showroom in the town, about 80 km (50 miles) northeast of Baghdad, the sources said.
A police officer at the scene said the car had been left at the centre by a man who said he would return soon, and exploded about 30 minutes after he left.
Police closed off entrances to the town after a report of another possible car bomb, the officer said.
Violence in Iraq has dropped sharply in recent years following the peak of sectarian warfare in 2006-07, but security forces are still battling a Sunni Islamist insurgency.
Ethnically and religiously mixed Diyala province saw some of the worst fighting in the war.
(Reporting by Reuters Television; writing by Jim Loney; editing by Andrew Roche)