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.
May 21, 2018 0
The 2018 Boao Forum for Asia (BFA) annual conference is scheduled for April 8 to 11 in Boao, Hainan Province. The forum will be themed "An Open and Innovative Asia for a World of Greater Prosperity."
— The Daily Mail - People's Daily