(1) : Every investigation under this Chapter shall be completed without unnecessary delay, and, as soon as it is completed, the officer in charge of the police station shall "(a) forward to a Magistrate empowered to take cognizance of the offence on a police report a report, in the form prescribed by the State Government, setting forth the names of the parties, the nature of the information and the names of the persons who appear to be acquainted with the circumstances of the case, and stating whether the accused (if arrested) has been forwarded in custody, or has been released on his bond and, if so, whether with or without sureties, and "(b) communicate, in such manner as may be prescribed by the State Government, the action taken by him to the person, if any, by whom the information relating to the commission of the offence was first given. "(2) Where a superior officer of police has been appointed under section 158, the report shall, in any case in which the State Government by general or special order so directs, be submitted through that officer, and he may, pending the orders of the Magistrate, direct the officer in charge of the police station to make further investigation. "(3) Whenever it appears from a report forwarded under this section that the accused has been released on his bond, 750 the Magistrate shall make such order for the discharge of such bond or otherwise as he thinks fit. "(4) After forwarding a report under this section the officer in charge of the police station shall, before the commencement of the inquiry or trial, furnish or cause to be furnished to the accused, free of cost, a copy of the report forwarded under sub section (1) and of the first information report recorded under section 154 and all other documents or relevant extracts thereof, on which the prosecution proposes to rely, including the statements and confessions, if any recorded under section 164 and the statements recorded under sub section (3) of section 161 of all the persons whom the prosecution proposes to examine as its witnesses.