Medics carry an injured at the explosion site in the busy center of Turkish capital, Ankara, Turkey, Sunday, March 13, 2016. The explosion is believed to have been caused by a car bomb that went off close to bus stops. News reports say the large explosion in the capital has caused several deaths and many casualties. (Photo by AP Photo)





People carry a person wounded in an explosion in Ankara, Turkey, Sunday, March 13, 2016. At least 37 people have died after a car bomb exploded in the Turkish capital Ankara, less than a month after a suicide car bomber killed dozens of military personnel and civilians in the city. Mehmet Muezzinoglu, the health minister, said a further 71 people were still being treated in hospital, with 15 in a serious condition. President Recep Tayyip Erdoğan vowed to defeat terrorists who have staged a series of attacks on Turkey in the past 18 months. According to local broadcaster TRT, a car exploded near a transport hub in an area that also houses many administrative buildings, including the justice and interior ministries, a court and a police station. A large number of fire engines and ambulances have rushed to the scene. There were reports of burnt-out busses and damage to several buildings. TRT said the area was crowded when the bomb went off at 6:43pm (4:43pm GMT), only blocks from the scene of a similar attack in February. (Photo by Osmancan Gurdogan/Depo Photos via AP Photo)





Members of emergency services work at the scene of an explosion in Ankara, Turkey, Sunday, March 13, 2016. A television channel said the bomb exploded close to bus stops near a park at Ankara's main square, Kizilay. The 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. (Photo by AP Photo)





Members of emergency services work at the scene of an explosion in Ankara, Turkey, Sunday, March 13, 2016. (Photo by AP Photo)





Members of emergency services work at the scene of an explosion in Ankara, Turkey, Sunday, March 13, 2016. (Photo by AP Photo)





Dogan Asik, 28, who was blown away from inside a bus by a powerful explosion speaks at the explosion site in the busy center of Turkish capital, Ankara, Turkey, Sunday, March 13, 2016. (Photo by Burhan Ozbilici/AP Photo)





Emergency services work at the explosion site in the busy center of Turkish capital, Ankara, Turkey, Sunday, March 13, 2016. (Photo by AP Photo)





Emergency personnel work near a burning vehicle after an explosion in Ankara, Turkey March 13, 2016. (Photo by Mehmet Ozer/Reuters)





Damaged vehicles are seen at the scene of an explosion in Ankara, Turkey, Sunday, March 13, 2016. (Photo by Selahattin Sonmez/Hurriyet Daily via AP Photo)





People carry an injured person after an explosion in the busy center of Turkish capital, Ankara, Turkey, Sunday, March 13, 2016. (Photo by Selahattin Sonmez/Hurriyet Daily via AP Photo)





Members of emergency services work at the scene of an explosion in Ankara, Turkey, Sunday, March 13, 2016. (Photo by Riza Ozel/ Hurriyet Daily via AP Photo)





Firefighters spray water at the wreckage of a car to put out a fire caused by an explosion in Ankara, Turkey, Sunday, March 13, 2016. (Photo by Selahattin Sonmez/Hurriyet Daily via AP Photo)





People carry an injured person after an explosion in the busy center of Turkish capital, Ankara, Turkey, Sunday, March 13, 2016. (Photo by AP Photo)





Members of emergency services work at the scene of an explosion in Ankara, Turkey, Sunday, March 13, 2016. (Photo by AP Photo)





Members of emergency services work at the scene of an explosion in Ankara, Turkey, Sunday, March 13, 2016. (Photo by AP Photo)