After an intense search, the FBI arrested a 21-year-old National Guardsman named Jack Teixeira, on Thursday for leaking classified US Intelligence documents.

The documents created chaos after he shared them on an online chat group. In one instance, the documents indicated that Ukraine will soon run out of artillery and even more damning, exposed some U.S. intelligence sources around the world.

He was a member of the intelligence wing of the Massachusetts Air National Guard, so he had free access to top-secret information.