At least one person is dead as another person remains missing with at least 10 injured following a series of explosions at a steel plant in Clairton, Pennsylvania, on the outskirts of Pittsburgh, on Monday, Aug. 11, officials said.

Pennsylvania Gov. Josh Shapiro said that the U.S. Steel Clairton Coke Works plant was the site of "multiple explosions," and that search-and-rescue efforts continued at the scene as of a statement posted to social media just after 2:15 p.m. ET.

The Allegany County Police Department confirmed that one person died in a statement posted to Facebook just before 4:30 p.m. ET. The department stated that one person previously believed to be missing had been located and transported to a local hospital. The second person believed to be missing remains unaccounted for, the statement added.

Nine other people were transported to area hospitals to receive treatment for a variety of injuries, according to the department.

Video of the explosions, which took place around 10:30 a.m. ET, was captured by the BreatheProject, a Pittsburgh-based nonprofit that advocates for improvements to air quality in southwestern Pennsylvania.

The video shows a plume of dark smoke rising from the plant that continued to spew for over 25 minutes.

Residents near plant advised to stay indoors

The Allegheny County Department of Health issued a statement saying it was "actively monitoring the explosion" in coordination with first responders.

Residents within one mile of the plant were being advised "out of an abundance of caution" to remain indoors, close windows and doors and set their home cooling units to recirculation. Air quality monitors had not detected levels of toxins above federal standards, the department said.

"If you’re in the area, continue to follow the instructions of local authorities," Shapiro said in his statement.

U.S. Steel Executive Vice President Scott Buckiso told reporters at an afternoon news conference that the plant is stable except for the two coke oven batteries that were shut down after the 10:50 a.m. explosion. An investigation into the cause has begun as part of the search for the missing worker.

"It's an ongoing rescue effort for the one person that is still not accounted for,'' Buckiso said. "We think we know the general location of that employee, but we're not 100% sure.''

This is a developing story

Contributing: Melina Khan & Phaedra Trethan – USA TODAY

This article originally appeared on USA TODAY: Video captures Pennsylvania steel plant explosion that left at least 1 dead

Reporting by James Powel and Jorge L. Ortiz, USA TODAY / USA TODAY

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