"ATF is committed to using its statutory jurisdiction and all of its available assets to address threats of violence against our Nation, and to assist other countries with addressing similar threats. Because firearms and explosives are the tools of terrorists, ATF's investigative expertise and technology are essential to the war on terrorism. On both domestic and international fronts, ATF is involved in efforts to prevent the next terrorist act, respond to terrorist incidents, and ensure that knowledge and intelligence information is shared within the law enforcement community. ATF's enforcement and regulatory efforts are critical to deny terrorists the tools of their trade. The same activities that help protect the American public from the threat of violent crime also help safeguard it against threats of terrorism."
United States Department of Justice, Bureau of Alcohol, Tobacco, Firearms and Explosives: http://www.atf.gov/