WASHINGTON (CBSDC/AP) — The Pentagon admits that a Guantanamo Bay detainee was struck by a “rubber bullet” in an effort to quell a disturbance at the prison.

The Associated Press reports the incident happened early January after a detainee attempted to climb a fence while other detainees threw rocks at a guard tower.

Army Lt. Col. Joseph Todd Breasseale says a guard fired one “crowd-dispersal round” in which a detainee was struck.

“It was a minor wound. As you can imagine these come out at a fairly high velocity but it wasn’t serious enough to warrant medical care … and when they offered it for follow-up he said he didn’t want any,” Breasseale told the AP.

The incident was disclosed by the military after Clive Stafford Smith, an attorney who represents Gitmo prisoners on behalf of the British human rights group Reprieve, asked for an investigation to be conducted into the incident.

It is reportedly the first time a shooting has taken place at Guantanamo Bay since the United States began holding terror suspects on the prison base in 2002.

The military reviewed the incident and determined the guard followed proper protocol to quell the disturbance.

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