At least 20 people have been killed in a bomb attack in the Turkish capital Ankara.

The explosion hit the city's main train station just after 8 o'clock this morning.

Turkey's Anadolu News Agency is reporting that a suicide bomber may have carried out the attack.

Hundreds of people had been gathering in the area for a peace rally.

The demonstration is calling for an end to the conflict between Kurdish group the PKK and the Turkish armed forces.