(1) Where in any establishment an accident occurs which causes death or which causes any bodily injury by reason of which the person injured is prevented from working for a period of forty-eight hours or more immediately following the accident, or which is of such a nature as may be prescribed, the employer shall give notice thereof to such authority, in such form and within such time as may be prescribed.
     (2) On receipt of a notice under sub-section (1) the authority referred to in that sub-section may make such investigation or inquiry as it considers necessary.
     (3) Where a notice given under sub-section (1) relates to an accident causing death of five or more persons, the authority shall make an inquiry into such accident within one month of the receipt of the notice.