"Travel restrictions to Belgium were implemented March 22, 2016," the army said. "They apply to all uniformed service members, civilian and contractor employees, and command-sponsored dependents."
The US Army would not specify how long the travel restrictions will stay in place.
Earlier in the day, a series of blasts hit Brussels` Zaventem airport and a central metro station, killing at least 31 people and injuring some 250 others. The Belgian authorities are treating the explosions as part of a coordinated terrorist attack.
US European Command (EUCOM) has confirmed earlier on Tuesday that a US military service member and his family were injured in the attacks.
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