Omaha Fire crews extinguished an intentional fire at an unoccupied business off North 24th and Grant streets around 1:30 a.m. Sunday. Officials don't have anyone under arrest for causing it at this time, according to a department report. Crews initially found smoke and fire at the scene. The structure was closed and secured at the time of the fire. OFD had to cut into the building since doors and windows were blocked with steel bars. Crews quickly extinguished the fire.