Provincial Police are trying to figure out what happened to cause a school bus filled with senior citizens to go off the road in Denbigh, north of Napanee.
The single vehicle crash happened just before 10 a.m. today on Highway 28, just east of Highway 41.
The bus somehow left the roadway and ended up in the ditch.
Police say there were about 50 people on board at the time.
Ten people were taken to hospital with minor injuries.
Investigators remain on the scene and one lane of Highway 28 remains closed.