THE BRONX - Officials have deemed a powdery substance found inside a Bronx office building non-hazardous.Police responded to a call just before 11 a.m. today for a substance found under one of the desks on the fifth floor of 1 Fordham Plaza. About 20 people needed to be isolated and contained. Hazmat teams who were sent to the office determined that the powder was non-hazardous. Police are still investigating just what the substance is.