The cause of last night’s house fire in Beaver Falls which displaced seven people has been ruled undetermined…and that’s why the fire chief is calling in the fire marshal. The fire in the 600 block of 9th Street was reported shortly before 10:30 last night. No one was injured. Chief Mark Stowe tells Beaver County Radio newsman Pat Septak that the fire marshal will be in tomorrow to investigate the cause of the blaze. No one was injured. The Red Cross says it is providing temporary shelter for the seven adults who lived in that single family home.