A quick-thinking storekeeper doused a fire with an extinguisher when an electricity transformer exploded amid heavy rain in Thailand.

Footage shows the brave vendor battling to put out the flames that had erupted at a market during a downpour in Nakhon Ratchasima province on September 4.

The fire was caused by an electric transformer believed to have short-circuited from being drenched by the tropical rainstorm.

Onlooker Rungrassamee Sri-apai said: 'I was waiting for the rain to subside when I heard a loud explosion nearby. The shoppers scattered when they heard the sound and saw the fire spreading from the electric pole.

'Luckily, the storekeeper acted fast and grabbed a fire extinguisher before the fire could grow.'

Rungrassamee added that the fire did not cause extensive damage to the shop.

Thailand and neighbouring countries in Southeast Asia are in their annual monsoon rainy season which sees soaring temperatures followed by powerful rain storms in the afternoon leading to widespread flash floods.