(CNN) A military training exercise at Camp Shelby in Mississippi left at least 23 paratroopers injured after they missed their landing spot by as much as 400 yards, A US Army colonel said.

Members of the 4th Brigade Combat Team, 25th Infantry Division out of Alaska were conducting night jumps late Wednesday at Camp Shelby Joint Forces Training Center , said 25th Infantry spokesperson Cpt. Ashley Sangster.

Three aircraft were operating near two jump sites in a military exercise, Sangster said.

The training exercise is on hold and may resume Friday as the Army investigates the cause of the accident, Col. Christopher Landers said.

It's possible human error played a role, Landers said at a press conference Thursday. Spotters with night vision goggles were on the ground, communicating with the jump teams.

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