53 Pa. Stat. § 14526
The Fire Marshal of every city of the first class of this Commonwealth shall make, or cause to be made, an investigation of the cause, origin, and circumstances of every fire occurring in such city, by which property has been destroyed or damaged, and shall especially make investigation as to whether such fire was the result of carelessness or design. Such investigations shall be begun immediately after the occurrence of such fire, and the Fire Marshal shall have the right to supervise and direct such investigation whenever the deems it expedient or necessary. The officer making investigation of fire shall forthwith notify said Fire Marshal, and shall within one week of the occurrence of fire furnish to the said Fire Marshal a written statement of all facts relating to the cause and origin of the fire, and such other information as may be called for,--the blanks provided by said Fire Marshal. The said Fire Marshal shall keep in his office a record of all fires occurring, together with all facts, statistics, and circumstances, including the origin of the fires, which may be determined by investigations provided by this act; such records shall at all times be open to the public inspection.
53 P.S. § 14526