All 15 people hospitalized after a passenger train derailed in southern Russia’s Krasnodar Region on Sunday are in satisfactory condition, the local Health Ministry said on Monday, according to RIA Novosti.

“The necessary medical assistance was rendered to all injured… Their condition is satisfactory,” the ministry said in a statement.

Five train cars overturned and another three fell onto one side in the derailment, in the district of Kushyovsky, about 140 kilometers north of Sochi, according to Oleg Voronov, a spokesman for Russia’s Emergency Situations Ministry.

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About 70 people of the more than 600 aboard were reportedly injured in the wreck. Fifteen, including five children, have been hospitalized.

An official earlier cited the locomotive’s engineer as saying summer heat might have distorted the tracks, causing the derailment. A high of 33 degrees Celsius (90 Fahrenheit) was reported for the area that day.