At least six people have been killed after a passenger train collided with a double-decker city bus in the Canadian capital, Ottawa.

Emergency officials said 30 other people were hospitalised with 11 people in critical condition.

Television images showed a heavily damaged bus, with firefighters and ambulances at the scene.

The front of the bus appeared to be sheared off by the collision.

VIA Rail, which operates the national passenger service in Canada, confirmed the crash and said there were no major injuries reported on the train, which was heading to Toronto.

Canadian Prime Minister Stephen Harper said he was "deeply saddened" to hear about the collision.

The crash occurred in the rural west end of Ottawa at a level crossing surrounded by corn fields.

Ottawa Paramedic Service chief Anthony DiMonte said five bus passengers were declared dead at the scene, while a sixth person died later.

A deadly train crash killed 50 people and destroyed the centre of Lac-Megantic town in Quebec on 6 July.

Canada's two big train companies - Canadian National Railway Co and Canadian Pacific Railway Ltd – are currently reviewing safety standards following that crash.