BAGHDAD - A female suicide bomber exploded herself in a crowd of police recruits northeast of Baghdad on Tuesday, killing at least 14 people, police and hospital officials said.

Demonstrators wave Iraqi flags as they march during a rally marking four years to the day since Baghdad fell to invading American troops, in Najaf, south of Baghdad, April 9, 2007. [Reuters]

The woman, wearing a black abaya, walked into a crowd of about 200 police recruits at the main gate of the Muqdadiyah police station, a police officer on the scene said. He spoke on condition of anonymity because he was not authorized to speak to the media.

At least 14 people were killed and 20 injured, according to an official at Muqdadiyah General Hospital.

Muqdadiyah lies about 60 miles northeast of Baghdad.