A bomb placed under a police car exploded on Sunday, wounding 14 people at a concert venue in southern Turkey, state-run Anatolian news agency reported.

It said two police officers were among the wounded and were in a critical condition. Police declined to comment on the explosion which occurred around 10 p.m. (1900 GMT) in the southern Turkish port city of Mersin, where well-known Turkish pop singer Candan Ercetin was performing on the last day of a local music festival. It was not clear what the motive behind the bombing might be. Kurdish separatists, leftists and Islamist militants have all carried out bomb attacks in Turkish cities in the past. Turkish television pictures showed people in blood-stained clothes being carried away from the scene of the blast to waiting ambulances. Bomb disposal experts destroyed one suspicious package at the venue and were working on destroying a second package, Anatolian said.

CNN Turk television said on its Web site that 20,000 people attended the concert, which was just finishing when the blast happened, causing panic among the audience. Turkish Prime Minister Tayyip Erdogan telephoned the local governor to gather information on the explosion, CNN said.

It said police had launched an extensive operation in connection with the blast, which was the latest in a series of explosions in Mersin. In the last two months there have been explosions at a hotel, a bank and local offices of Erdogan’s ruling Justice and Development Party in the city, CNN reported.

Last November, a series of suicide bomb attacks on Jewish synagogues and British targets in Istanbul killed more than 60 people. Authorities have long blamed Turkish nationals linked to Osama bin Laden’s al Qaeda network for those bombings and a trial of dozens of defendants is ongoing.