The U.S. military says one American service member and his family were injured in the Brussels attacks.

U.S. European Command says it will not release details of the injuries or the number of family members involved, due to privacy concerns. The command says it is continuing to confirm the safety of U.S. military personnel and families in the region, including those who may be there on vacation or official travel.

The injuries bring the total to at least four Americans who were hurt in the explosions that ripped through the Brussels Airport and a metro station Tuesday. Mormon church officials said three missionaries from Utah were seriously injured in the airport attack and have been hospitalized.

The Islamic State militant group (IS) has claimed responsibility for the attack.