A taxi loaded with explosives blew up right next to the crowded front gates of a prison just north of Baghdad on Monday.
The explosion killed at least 19 people and another 22 were injured. Ten of the casualties were policemen, the Associated Press reported.
This is the third attack in less than a week and it has increased the Iraqis fears of an increase in insurgent attacks as the United States continues to withdraw its military, the New York Times reported.
No terrorist group has claimed the attack, but the tactics used suggests the work of the Qaeda affiliate in Iraq.