One person died and three others were injured Tuesday in an explosion at a U.S. Army ammunition plant in Independence, Mo., according to the Army’s Joint Munitions Command.

Officials said the explosion happened in a mixing building at Lake City Army Ammunition Plant in Independence.

Three of the plant’s employees were taken to a hospital for evaluation. Authorities did not say how extensive their injuries were.

Officials did not immediately release additional information on the person who was killed or the cause of the blast.

The plant manufactures small-caliber munitions and operates the North Atlantic Treaty Organization test center. Founded in 1941, the plant employs 29 people from the Army Civilian Service and one soldier, along with an unknown number of contractors.

The plant is on 3,935 acres of land about 20 miles east of Kansas City.

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