March 25 (Reuters) - Rescuers combed through rubble on Saturday after a powerful storm tore across Mississippi overnight, killing at least 25 people there and another in Alabama, leveling dozens of buildings and spawning at least one devastating tornado. The tornado stayed on the ground for about an hour and cut a path of destruction some 170 miles (274 km) long, according to preliminary information, said Nicholas Price, a meteorologist with the National Weather Service in Jackson, Mississippi. See here for a complete list of exchanges and delays