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A fire erupted in Kuwait during maintenance work at a major oil refinery on Friday, injuring 10 people, five of them severely, the Kuwait National Petroleum Company said.

This is the second fire to erupt at the in Kuwait in as little as three months. In October, the state-owned oil company reported a fire had erupted at the facility, with some workers suffering from smoke inhalation and others being treated for light burns.

In this latest fire, the company said, five people were being treated at a nearby hospital for severe burns and another two for moderate burns. Others received treatment at an on-site clinic.

The company said the fire broke out at a gas liquefaction unit that had been out of service for maintenance work. It said the fire was extinguished and that operations at the refinery were not affected because the unit damaged was already out of service.

The refinery was built to handle 25,000 barrels of oil a day to supply primarily with gasoline and diesel. The facility recently underwent an expansion to reduce its emissions and boost capacity to 346,000 barrels a day.

Kuwait, a nation home to 4.1 million people, has the world’s sixth-largest known oil reserves.