; and (ii) upon intervening— (I) be heard on all matters arising in the civil action; and (II) file petitions for appeal. (3) Investigatory powers Nothing in this subsection shall be construed to prevent the attorney general of a State from exercising the powers conferred on the attorney general by the laws of the State to conduct investigations, to administer oaths or affirmations, or to compel the attendance of witnesses or the production of documentary or other evidence. (4) Preemptive action by Federal Trade Commission If the Federal Trade Commission or the Attorney General on behalf of the Commission institutes a civil action, or the Federal Trade Commission institutes an administrative action, with respect to a violation of subsection (a), the attorney general of a State may not, during the pendency of that action, bring a civil action under paragraph (1) against any defendant or respondent named in the complaint of the Commission for the violation with respect to which the Commission instituted such action. (5) Venue; service of process (A) Venue Any action brought under paragraph (1) may be brought in any district court of the United States that meets applicable requirements relating to venue under section 1391 of title 28, United States Code. (B) Service of process In an action brought under paragraph (1), process may be served in any district in which the defendant— (i) is an inhabitant; or (ii) may be found. (6) Actions by other State officials In addition to civil actions brought by attorneys general under paragraph (1), any other consumer protection officer of a State who is authorized by the State to do so may bring a civil action under paragraph (1), subject to the same requirements and limitations that apply under this subsection to civil actions brought by attorneys general.