On Tuesday, the US Air Force announced that a service member was arrested in connection with an April strike in Syria that injured four other service members.

Initially, the United States military attributed the incident at Green Village, located in eastern Syria, to indirect fire, probably a rocket strike.

Later, the inquiry revealed that the explosions were caused by the "deliberate placement of explosive charges" at a storage area for munitions and a shower facility. Officials claimed they were investigating the possibility of an insider attack.

The Air Force refused to name the individual.

"As part of an ongoing investigation, on June 16, an Airman was taken into custody stateside in conjunction with the attack in Green Village, Syria," Air Force spokeswoman Ann Stefanek said in a statement.

"After reviewing the information in the investigation, the Airman's commander made the decision to place him in pretrial confinement."

CNN was the first news source to announce the arrest.

According to US military authorities, approximately 900 US personnel operate in Syria, mainly training and advising partner forces against Islamic State remnants.