Summary: Greenwich Fire Department units responded to a residential fire alarm at 34 Marr Avenue, Greenwich, Connecticut. The alarm was reported for zone 15, the second floor hallway, with smoke detected. Cross streets were Patterson Avenue and Mark Court. The keyholder was not on scene, and the back door was reported unlocked. Upon investigation, it was determined that the alarm was caused by cooking smoke, and there was no active fire. The scene was cleared and units returned to service.