Fire broke out at a MarkWest Energy Partners LP natural gas processing plant in Washington County, Pa., injuring four people, according to local media reports.
An explosion occurred at MarkWest's Houston processing plant Dec. 13 near two temporary tanks that were on site for routine maintenance, resulting in a fire that broke out around 6 p.m. ET, MarkWest said in a statement. The tank that caught fire held 200 barrels of liquid ethylene glycol plus hydrocarbons, CBS Pittsburgh reported.
The Marathon Petroleum Corp. subsidiary has shut down the facility as a precaution. All four of the injured, with one in critical condition, were MarkWest employees working at the plant. The fire has been put out and there were no evacuations in the area, according to Washington County first responders.
The cause of the fire is under investigation.