Earlier in that year on April 25, 1983, a small bomb detonated at the National War College at Fort McNair in Washington, D.C. A call coming into UPI in advance of the attack mentioned "U.S. imperialism." The National War College is where American military officials get high-level training. Following the attack, it was immediately sealed off. Of the device causing the explosion, Col. Jamie Walton of the Army remarked that it "appeared to be 5 to 10 pounds of unknown explosives detonated by some sort of timing device." Colonel Walton also reported no injuries were incurred, although there was superficial damage to the outside of the building.