A woman was killed and a man was injured when they were struck by a tour bus in Banff National Park on Wednesday.
Police said the two passengers got off the bus and were hit when the empty vehicle rolled forward and down an embankment at the Castle Mountain viewpoint between Banff and Lake Louise.
"A man and woman were standing in front of the bus," Cpl. Hal Turnbull said. "For some reason the bus rolled forward and struck both of them before going over the embankment and coming to rest at the bottom, which is about 20 metres or so."
No one else was injured.
The bus ended up partly submerged in the Bow River.
RCMP said the 53-year-old woman and the man, 55, are both from Ontario. Their names and hometowns were not released.
The man was being treated for serious injuries at a Calgary hospital.
The tour bus was operated by Calgary-based Amazing Travel, said Shawn Zhou, the company's manager.
Zhou said there were 20 passengers on the tour with one driver.
Police said the passengers were taken to a senior's centre in Banff.
The Castle Mountain viewpoint is a popular spot for tourists and hikers in the Bow Valley.