MOSCOW—Russian investigators have introduced a legal probe into a massive gasoline leak from a ability station in the Arctic right after President Vladimir Putin publicly admonished a senior formal over the incident and declared a countrywide condition of crisis.

The ability plant operator claimed accidental hurt to a diesel gasoline storage tank in the remote Siberian town of Norilsk caused 20,000 tons of gasoline to seep into the soil across a substantial area and contaminate bodies of water.