3. (1) The Government may, if satisfied with respect to any person that with a view to preventing him from doing any prejudicial act it is necessary so to do, make an order-(a) directing that such person be detained;(b) directing him to remove himself from Bangladesh in such manner, before such time and by such route as may be specified in the order:Provided that no order of removal shall be made in respect of any citizen of Bangladesh. (2) Any District Magistrate or Additional District Magistrate may, if satisfied with respect to any person that with a view to preventing him from doing any prejudicial act within the meaning of section 2(f) (iii), (iv), (v), (vi), (vii) or (viii) it is necessary so to do, make an order directing that such person be detained. (3) When any order is made under sub-section (2), the District Magistrate or the Additional District Magistrate making the order shall forthwith report the fact to the Government together with the grounds on which the order has been made and such other particulars as, in his opinion, have a bearing on the matter, and no such order shall remain in force for more than thirty days after the making thereof unless in the meantime it has been approved by the Government. (4) If any person fails to remove himself from Bangladesh in accordance with the direction of an order made under sub-section (1) (b), then, without prejudice to the provisions of sub-section (5), he may be so removed by any police officer or by any person authorised by the Government in this behalf. (5) If any person contravenes any order made under sub-section (1) (b), he shall be punishable with imprisonment for a term which may extend to three years, or with fine, or with both.