Bomb blasts hit rally in Turkish capital city

Two explosions have hit a peace rally in the Turkish capital Ankara, causing multiple casualties, reports say.

Turkish news agency Dogan said that at least 20 people have been killed. Photos posted on social media show a number of bodies at the scene.

The blasts took place near the city's central train station.

The target appears to have been a peace march calling for an end to the violence with the Kurdish separatist group, the PKK. 

The cause of the blast was not immediately clear but a government official told Reuters it was being investigated.

The explosion occurred at a time of growing security concerns in Turkey, and three weeks ahead of a parliamentary election.