Ambulances rushed to the scene of the explosion on Kizilay square, a key hub in the city, and television pictures showed burnt-out vehicles including a bus.
A local news channel said the explosion occurred as a car slammed into a bus, suggesting that the blast may have been caused by a car bomb. Several vehicles had caught fire, it said.
Police sealed off the area and pushed onlookers and journalists back, warning there could be a second bomb.
It comes just weeks after almost 30 people were killed in a car bomb attack targeting the military in the city on February 18.
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The 68th Anniversary of the Founding of the People’s Republic of China.
— The Daily Mail - People's Daily