An explosion killed four Asian workers at Kuwait's Ahmadi refinery on Saturday but it was not immediately clear whether production was affected, a spokesman for Kuwait National Petroleum Company said.

Several workers were injured at refinery, the KNPC spokesman added, without giving further details.

Media reports quoting officials said the explosion was caused by a leak in a gas pipe.

Mina al-Ahmadi is the largest of three refineries in Opec member Kuwait, with a refining capacity of over 460,000 barrels per day. It was not immediately clear if the explosion would hit the country's crude exports.-Reuters