UPDATE | Emergency crews responding to crash involving coach bus

 OPP say at least 24 people are in hospital, four with life-threatening injuries, following a bus crash near Kingston on the 401.

The bus was carrying approximately 37 people, including the driver and a tour guide.

It's believed the bus was carrying Asian tourists and do not speak English.

The bus went off Highway 401 and hit a rock cut between Brockville, Ont., and Prescott, Ont.

Ornge air ambulance has said it is responding to the scene, which is about 95 kilometres south of Ottawa.