Authorities in Hesston, Kansas, responded to a workplace shooting that left four to seven people dead (including the shooter) and up to 20 others injured on Thursday, the Harvey County Sheriff's Office confirmed.

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Harvey County Sheriff T. Walton confirmed that the shooter was an employee of Excel Industries who opened fire in the parking lot outside the company around 5 p.m. and continued to shoot employees inside the building, KWCH 12 reports. Walton also said that the shooter was killed by authorities.

"Walton said there could be as many as four crime scenes — the Excel facility, another location in Hesston, where a person was shot in the leg, the town of Newton, where a man was shot in the shoulder, and a fourth location," NBC News reports. Information about shootings outside the Excel facility is developing.

Multiple hospitals in the area are treating victims. The status of those injured in the shooting is not currently known.

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Hesston College, which is located just blocks away from Excel Industries, was placed on lockdown following reports of the shooting. Hesston is a small town of approximately 3,700 people that's located about 30 miles away from Wichita, Kansas.

This story is developing. ATTN: will update this article as updated information becomes available.