A massive explosion at a petrol station in Russia's southern republic of Dagestan has killed 35 people and injured scores more.
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Russia's Health Ministry said 115 people were injured in the blast and subsequent fire, and 35 of them died, including three children.
A total of 65 of those injured, including 16 children, remained in hospital as of midday on Tuesday, the ministry said. Eleven people, including two children, were in a grave condition.
The explosion occurred on Monday night on the outskirts of Makhachkala, the region's capital. A fire started at a car repair shop and spread to a nearby petrol station, triggering the blast.
Families of the victims will receive one million roubles ($A15,375) each, Dagestan's authorities said, and those injured will get 200,000-400,000 roubles.
Russian state media said some of those injured would be airlifted to Moscow for treatment.
Makhachkala is about 1583km south of Moscow.
The authorities have begun a criminal investigation as Tuesday was declared a day of mourning in Dagestan.
Also on Monday night, a blast in western Siberia killed two people and wounded five others. The explosion occurred at an oil mine in the Khanty-Mansiysk region late in the evening, authorities said.
A blast at a factory north of Moscow that makes optical equipment for Russia's security forces killed one person and injured 84 more earlier this month.
Australian Associated Press