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SMITHSBURG, Md. – The man accused of killing three co-workers Thursday at a Maryland manufacturing facility and injuring two other people has been identified as a 23-year-old West Virginia man.

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Washington County sheriff’s deputies said Joe Louis Esquivel, of Hedgesville, West Virginia, is facing more than two dozen charges, including three counts of first-degree murder and five counts of first-degree assault. He was being held Friday without bond at the Washington County Detention Center.

Authorities said Esquivel worked a normal shift at Columbia Machine Inc. on Thursday before leaving to grab a weapon from his vehicle. He went back into the business and opened fire on employees in the company’s breakroom, killing 50-year-old Mark Allen Frey, 31-year-old Charles Edward Minnick Jr. and 30-year-old Joshua Robert Wallace.

Deputies said they found a fourth person, 42-year-old Brandon Chase Michael, injured outside of the business after they were called around 2:30 p.m.

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After the shooting, authorities said Esquivel left Columbia Machine in his car. A Maryland State Police trooper found him about six miles way, near the intersection of Mapleville Road and Mount Aetna Road, deputies said. Esquivel and the trooper exchanged gunfire, causing injuries to them both.

Deputies said Esquivel and the trooper were transported for medical treatment after the shooting. The trooper, who was not identified, had injuries that did not appear to be life-threatening. He was treated and released Thursday from Meritus Medical Center in Hagerstown, officials said.

The circumstances leading up to Thursday’s shooting remain unclear. Authorities continue to investigate.