4 killed in Bulgarian explosion following train derailment

Firefighters in Bulgaria say at least four people were killed and 23 injured when a train derailed and containers of gas exploded.

Nikolay Nikolov, who heads the country's firefighting department, said at least 20 buildings in the village of Hitrino in northeastern Bulgaria were destroyed in the blast early Saturday as containers carrying liquefied petroleum gas exploded.

Nikolov says the immediate surroundings of the site have been evacuated, and that the cause of the disaster was unclear.