TULSA, Okla. (AP) - Officials say crews have contained a large fire at a Tulsa oil refinery that caused a loud explosion overnight and that could be seen from miles away.

Refinery owner HollyFrontier Corp. says all workers are accounted for and no one was injured in the early Thursday blaze. Neighbors told local news outlets they were woken by a loud explosion before 3 a.m.

The company says the fire started in the diesel hydrotreater unit at its Tulsa East refinery. It says its emergency response team contained the fire and that the community isn't at risk.

HollyFrontier is based in Dallas and operates four other refineries in Kansas, New Mexico, Utah and Wyoming. It says on its website that the Tulsa refinery has a daily crude oil capacity of 125,000 barrels.