UPDATE: 4 injured in explosion in vehicle shop at Pennsylvania Army depot | WHAM

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Employees evacuate the area following an incident Thursday, July 19, 2018, at Letterkenny Army Depot in Chambersburg, Pa.. A small explosion Thursday in a vehicle shop at the Army depot injured at least four workers, three of them seriously, officials said. (Markell DeLoatch/Public Opinion via AP)

Photo: WHP (CBS21 News)<p></p>

Photo: WHP (CBS21 News)<p></p>

Photo: MGN Online<p></p>

Letterkenny Army Depot Commander Col. Stephen Ledbetter, leads a press conference about an explosion in a paint shop that injured workers Thursday morning, July 19, 2018 at Letterkenny Army Depot, in Chambersburg, Pa. (Markell DeLoatch, Public Opinion/via AP)

Employees evacuate the area following an incident Thursday, July 19, 2018, at Letterkenny Army Depot in Chambersburg, Pa.. A small explosion Thursday in a vehicle shop at the Army depot injured at least four workers, three of them seriously, officials said. (Markell DeLoatch/Public Opinion via AP)

An explosion was reported at around 7 a.m. Thursday morning, July 19, 2018 at Letterkenny Army Depot, in Chambersburg, Pa. A small explosion Thursday in a vehicle shop at the Army depot injured at least four workers, three of them seriously, officials said. (Markell DeLoatch/Public Opinion via AP)

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