TEHRAN (Press Shia Agency) – Three people are missing and a search is underway after a tanker exploded in the port of Makhachkala, according to the press service of the Russian Federal Agency For Maritime.

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The explosion at the Makhachkala Commercial Sea Port was caused by an air-gas mixture on the tanker catching fire; five were injured, Sputnik reported.

“A duty officer of the Rosmorrechflot received a message about an explosion in the engine space and smoke in the accommodation space at the VF TANKER 16 in the city of Makhachkala. At the moment of the incident, the tanker was near the fourth pier of the sea port in the city of Makhachkala. Presumably, five people were injured… Search for three people is underway,” Rosmorrechflot said.

One of the victims is in critical condition and has sustained burns on 95% of his body, a representative of the regional Ministry of Health said.

The tanker belongs to the Volga Shipping Company, according to preliminary data.

Russian investigators have already launched probe into the incident.