A huge explosion has taken place in the Kizilay neighbourhood of the Turkish capital Ankara, with reports of injuries. Turkish broadcaster NTV said the blast was caused by a car bomb, but this has not been confirmed. Witnesses say the explosion happened near the main bus station on Ataturk boulevard and close to many government ministries. Some vehicles were on fire. Last month, a bomb attack on a military convoy in Ankara killed 28 people. The Turkish Hurriyet newspaper said the latest blast happened at about 18:35 (16:35 GMT) in the Guven park in Kizilay, and that many ambulances were at the scene. It said that the area was being evacuated in case there was a second attack. Last month's attack was claimed by a Kurdish militant group, the Kurdistan Freedom Hawks (TAK). It said on its website that the bombing was in retaliation for the policies of President Recep Tayyip Erdogan. Turkey, however, blamed a Syrian national who was a member of another Kurdish group.