At least 20 people have been killed in a suicide bombing at a police recruitment centre in the Iraqi city of Falluja, police say.
Dozens more people were wounded in the attack, which occurred at about 1100 (0700 GMT).
Falluja lies west of Baghdad in Anbar province, an area that has seen heavy fighting between US and Iraqi forces and Sunni Arab insurgents.
Police recruitment centres have been a regular target of insurgent attacks.
Police said the bomber was wearing an explosives vest and had passed through several checkpoints when the device was detonated among a crowd of police recruits, the Associated Press news agency said.
Ten policemen are reported to have been killed.
The police recruitment centre had only opened on Saturday as a result of co-operation between US and Iraqi forces and a grouping of Sunni Arab tribes called the Anbar Salvation Council.
The tribes joined together last year in an attempt to fight al-Qaeda forces in Anbar province.
The province is one of the key battlegrounds in the insurgency, say correspondents, and pacifying it is one of the toughest challenges facing US and Iraqi forces.