An explosion started a fire at a natural gas processing plant about 40 kilometres south of Pittsburgh on Thursday, reports said.
The facility run by MarkWest Energy Partners experienced a blast that had dispatchers sending first responders to the scene in Houston, Penn. at just after 6 p.m. ET, KDKA-TV reported.
The incident unfolded close to two temporary tanks that were located on site for routine maintenance, according to a statement from Marathon Petroleum Corp.
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This resulted in a fire, the statement said.
WATCH: Emergency crews were on scene following an explosion at the MarkWest Energy gas plant in Pennsylvania on Thursday evening
![Click to play video: 'Aerial video of MarkWest Energy plant following explosion'](https://i0.wp.com/media.globalnews.ca/videostatic/604/219/2018-12-14T01-00-01.233Z--1280x720.jpg?w=1040&quality=70&strip=all)
Four people were hurt and taken to hospital.
The fire was later put out and the plant was shut down. There were no off-site effects, according to Marathon.
The cause of the fire is still being investigated.
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