A year later, on April 24, 1984, the a group calling itself the Guerilla Resistance Movement took responsibility for a bombing at the Officer's Club at the Washington Navy Yard. Their reasons for the bombing were opposition to U.S. policy in Central America and independence for Puerto Rico. The explosion at the officers club occurred at 1:50 A.M. An F.B.I. spokesman said it appeared to have been caused by a powerful bomb that was placed under a couch in an entryway to the club. The explosion blew out windows, knocked down part of a false ceiling and damaged the interior of the three-story, red-brick club building. There was nobody in the building at the time of the bombing and no one was injured. The effect of this bombing led to heightened focus on anti terrorism operations in the United States, and eventually led to the group's takedown four years later in 1988.