Three workers were injured this morning – one seriously – when a southeast Texas refinery was rocked by a chemical explosion followed by a fire.

Residents within a half mile of the plant in Port Neches, about 90 miles east of Houston, were ordered to evacuate during the emergency. Many had been awakened by the one a.m. blast, whose effects were felt several miles away. Some people reported it on social media, such as Twitter user @InventTrey, who said “the shockwave felt like my house got hit by a wrecking ball.”

News sources are reporting that one of the workers was transported by air to Houston with serious burns, a second was treated for a broken arm, and a third was treated and released.

TCP group, which owns the refinery, said in a statement that all of its workers at the site had been accounted for and evacuated from the building.