FBI special agents may make arrests for any federal offense committed in their presence or when they have reasonable grounds to believe that the person to be arrested has committed, or is committing, a felony violation of U.S. laws. The FBI is currently investigating whether the cops committed a violation of Lloyd's civil rights, but they don't have jurisdiction over murder cases. Normally civil rights cases are charged by grand jury indictment, which means that a grand jury would have to be convened. It's also possible for a person to be charged and arrested by way of a complaint, which is a written statement of essential facts establishing the offense charged made under oath by the agent before a magistrate-judge. Based upon the complaint, an arrest warrant may be issued upon the establishment of probable cause to believe that an offense has been committed and that the defendant committed it. This means a federal agent would have to go to a magistrate with the evidence to get a warrant. There may be some tactical or evidentiary reasons for not having arrested the officers. Clearly they won't be going anywhere.
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