(a)
There shall be a board of police pensions consisting of the mayor, president of the council and the comptroller, which board shall be the successor of the board of trustees of the police pension fund as heretofore constituted. Said board shall administer the police pension fund and grant all pensions therefrom. The director of the treasury shall be the treasurer of the fund.
(b)
The board shall have the power to make reasonable rules and regulations for the management and administration of said fund, to pay the necessary expense of administration therefrom, to take any legal action necessary for its protection, to administer oaths and take testimony of witnesses in matters pertaining to applications for pensions, to conduct investigations concerning any matters affecting said fund and, as to such matters, the board shall have all the powers of investigation conferred on the council by section 3-7 of this act.