Two explosives detonated within minutes of each other in a southern Turkish city Friday, seriously wounding one person and injuring 16 others, officials said.

The first blast occurred in front of a bank on a busy road in Adana, injuring two bank employees, Adana police chief Mehmet Cebe said.

The second explosion occurred some 30 yards away at a construction site after police had rushed to the scene of the first blast. Eight police officers and two police cadets were among the 15 injured in that blast, Gov. Cahit Kirac said.

Kirac said the first bomb was a percussion grenade — a type of explosive that usually makes a loud noise but causes limited damage. The second was a fragmentation bomb, he said.

There was no immediate claim of responsibility for the blasts. Leftist groups and Kurd separatists are both active in the region and have staged bombings in the past.