An explosion in a city in southeastern Turkey has killed one person and wounded two others. Police said the cause of Wednesday's blast outside a building housing businesses in Mardin city, was still under investigation. A police spokesman declined to say whether the blast was caused by a bomb. The state-run Anatolia news agency says the explosion sparked a fire that damaged five businesses before it was extinguished. Autonomy-seeking Kurdish rebels have carried out bomb attacks in the region in the past.