Crash closes Highway 49

GRASS VALLEY (CBS13) — Parts of Highway 49 in Grass Valley have been shut down due to a three-vehicle accident involving a 13 1/2 foot converted school bus that caused serious injuries. Choppers may be landing on the highway to transport victims to a nearby hospital.Authorities have not yet confirmed how many passengers have been injured in the incident.CBS13 will have further details as they become available.