At least 16 people were killed after a bus crashed into a crowd of people in south-eastern Bulgaria.

The bus, which was not carrying any passengers, failed to stop due to a technical fault as it drove down a hill.

The accident happened in the city of Yambol, 260km south-east of the capital Sofia.

The accident happened near the site of a local fair crowded with people, police said.

The bus driver suffered minor injuries.