An explosion occurs in the center of the Turkish capital of Ankara, with reports saying that a number of people have been killed or injured in the blast. The explosion took place near the Guven park in the Kizilay district of central Ankara. Reuters has cited a senior security official as saying that people have been killed and injured in the blast, without specifying the number of the casualties. Gunfire was also heard after explosion. Meanwhile, Turkish broadcaster NTV has been cited by reports as saying that there are many fatalities. NTV has also said that a car bomb caused the explosion. The explosion occurred less than a month after a car bomb attack in central Ankara killed 29 people. Kurdish militants claimed responsibility for that attack.