A large explosion at an oil refinery near the Texas coast on Monday shot plumes of smoke into the air and forced nearby residents to shelter in place, officials said.

No one was injured in the explosion at the Valero refinery in Port Arthur, about 90 miles (145 kilometers) east of Houston, Mayor Charlotte M. Moses said. She urged residents in parts of the west side of the city to stay put, saying firefighters had arrived.

“There’s been an explosion, yes, but we’re OK; everybody’s OK,” she said. “They’re trying to put the fire out as quickly as possible.”

The explosion comes amid a spike in gas prices driven by uncertainty over the global oil supply because of the Iran war.

The refinery has about 770 employees and can process approximately 435,000 barrels of oil per day, according to Valero’s website. The plant refines heavy sour crude oil into gasoline, diesel, and jet fuel.

Images and video posted online show a large plume of smoke and flames billowing out from the refinery. Some residents reported hearing a loud boom and seeing their windows shake.

“For your safety please remain in place until the ‘All Clear’ is given by emergency personnel,” the City of Port Arthur stated on its Facebook page.

Texas state Rep. Christian Manuel confirmed that the Texas Commission on Environmental Quality was on-site using air monitoring equipment to ensure community safety. He reiterated the importance of staying indoors and following local official recommendations.