Two miners have died after methane gas was unexpectedly released in a Ukrainian coal mine on Sunday.

The accident happened at about 16.00GMT at the Skochynsky mine, according to Reuters.

Eighteen workers who reached the surface of the mine after the accident are undergoing treatment and three others are still missing.

A similar accident took place at the same mine, owned by state-run Donetsk Coal Energy Company, in June last year, killing 13 workers.