Special agents of the Bureau of Alcohol, Tobacco, Firearms, and Explosives, as well as any other investigator or officer charged by the Attorney General with the duty of enforcing any of the criminal, seizure, or forfeiture provisions of the laws of the United States, may carry firearms, serve warrants and subpoenas issued under the authority of the United States and make arrests without warrant for any offense against the United States committed in their presence, or for any felony cognizable under the laws of the United States if they have reasonable grounds to believe that the person to be arrested has committed or is committing such felony.