Two tenants could be displaced after a small duplex fire near Memorial Drive on Thursday morning, Deputy Fire Chief Bill Ruchti said. Something was left cooking on the stove at the upstairs residence at 815 Harding St. before 11 a.m., causing the fire. Firefighters used an extinguisher to put out the flames within about 15 minutes, Ruchti said. The downstairs tenants probably will be able to return home, but the upstairs residents might not be so lucky, he said. Ruchti didn't immediately know exactly what caused the fire or extent of damage. Firefighters woke the downstairs tenants and told them to evacuate around 10:40 a.m. The tenants could see light-gray smoke from the upstairs windows as they left, one said. Harding Street was closed north of Memorial Drive as firefighters worked.