A total of 229 workers were evacuated from a coal mine in southern Russia on Sunday after it filled with smoke, a local official said, adding that there were no casualties.
It was unclear what caused the incident, which happened at a depth of nearly 200 metres (650 feet) at the Obukhovskaya mine in the city of Zverevo.
(Reporting by Marina Bobrova and Mark Trevelyan; Editing by David Goodman)