A suicide bomber has killed at least six people and wounded 17 others in the western Iraqi city of Ramadi, local officials say.
Police say the attacker drove a mini-bus loaded with explosives into a police checkpoint in the city centre.
At least two traffic policemen died in the attack and women and children are among the injured, officials said.
Ramadi is the main city of the western province of Anbar, formerly one of the centres of the Sunni insurgency.
But violence in the region has decreased sharply over the past two years, as tribal leaders deserted the militants and backed US-led forces.
Police Lt Hatim Abd said officers had been monitoring vehicles as they passed through the checkpoint in the city centre when a vehicle at the end of the queue exploded.
"We have shut down all the roads in the area and evacuated the wounded and those killed to the Ramadi hospital," he said.
A doctor at the Ramadi hospital said some of the injured were in a serious condition and the death toll could rise.
The bombing comes two weeks after US forces completed their withdrawal from Iraq's towns and cities.