On Thursday, one person died and dozens were trapped after a fire broke out in a coal mine in Russia’s Siberia’s Kemerovo region, according to emergency services and local authorities, with a rescue operation underway that had already saved more than 200 people.

According to Russia’s emergency services, there were 285 people in the Listvyazhnaya mine, and 236 had been brought to the surface. The rescue operation was still in progress.

Regional Governor Sergei Tsivilev said on his Telegram channel that one person had died and 43 others had been injured, two of whom were in critical condition, according to news reports.

“According to preliminary data, a number of workers suffered from smoke poisoning. The number of victims is being specified,” the regional branch of Russia’s Investigative Committee said in an earlier statement.

It had initially said 115 miners had been working at the time of the fire.