Officials say an explosion near a police station in southern Afghanistan has killed three people and wounded 17.
Provincial government spokesman Samim Khpalwak said the explosion on April 21 struck Kandahar city, the capital of Kandahar Province.
Authorities initially believed a car bomb caused the explosion, but later said they were unsure what happened.
Qayyum Pokhla, the head of Kandahar's regional hospital, said the blast killed three people, including two police officers and one woman. He said the explosion wounded 17 people.
No group immediately claimed responsibility for the attack.
Kandahar is the heartland of Taliban insurgents, and the city was the capital of the extremists' 1996-2001 regime.
Insurgents have stepped up attacks on Afghan security forces as they mount their annual warm-weather offensive.