Authorities are seeking the public’s help after a Sunday night blaze in downtown Topeka was ruled intentionally set. The fire was reported around 7:30 p.m. Sunday at a building at 1301 S. Kansas Ave. Topeka Fire Marshal Todd Harrison said first-arriving crews found flames and smoke coming from the rear of the two-story brick structure. Firefighters contained the blaze to the building where it started. Harrison said the fire started in a pile of debris behind the building and spread to the structure. A fire investigator responded to the scene and determined the blaze was incendiary in nature, or intentionally set. The estimated loss in the fire was $1,000, with all of the damage to the structure.