COFFEYVILLE, Kansas - A fire in at the Coffeyville, Kansas oil refinery sent four workers to the hospital early Tuesday.

Coffeyville city manager Gary Bradley says the city’s fire department was sent to the Coffeyville Resources refinery just before 12:30 a.m. after a pump at the facility caught fire.

He says four workers suffering burns and were taken to Coffeyville’s hospital. Bradley says one of those injured was in serious condition.

Bradley says the fire department provided backup for the refinery’s emergency response team and helped care for the injured.

He said the fire was out by 1:20 a.m.

CVR Energy isn't naming the employees who were hurt and transported to an area hospital, but says it is providing assistance to the workers and their families.

CVR Energy says the refinery has a rated capacity of 115,000 barrels per day.

Bradley says the cause of the fire remains “unclear,” adding there was no explosion.