13 people have been killed and ten others injured in a suicide bomb attack at a recruitment centre for neighbourhood patrols in Iraq's Diyala province.
Police said US forces may have also been among the casualties in the attack that took place in Kanaan, 20 km southeast of Baquba.
The police also said the casualty toll could rise.
The neighbourhood patrols are among the measures Washington says have led to a 60% drop in attacks in Iraq since June.
However, the patrols have increasingly been targeted by militants.
