Terrifying moment petrol station erupts in huge explosion killing four after fire broke out as locals evacuated

THIS is the terrifying moment a petrol station is engulfed in flames after a devastating fireball blast.

Four people died after a gas cylinder is believed to have caught on fire with footage showing a horror inferno as locals ran for their lives.

Footage from Dagestan, Russia , shows the gas station up in flames with black clouds of smoke billowing through the air.

As the initial fireball raged on, a second, far more devastating blast erupted as the remaining gas cylinders and pumps all exploded.

Video filmed by a terrified local shows much of the village of Sulevkent in the Khasavyurt district attacked by a bright orange flash as the second blast hits.

The deafening sound of the inferno was met with the sight of debris flying through the air.

Residents who had left their homes