Footage showed the bus stopped with a smashed windscreen and emergency vehicles including police cars, ambulances and a fire engine in attendance.
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At least 15 people have been hospitalised after a double-decker bus mounted the pavement and crashed outside one of London's busiest railway stations.
Police said another two people were treated by medics at the scene of the crash near Victoria Station on Thursday.
None of the injures is believed to be life-threatening.
The driver of the route 24 bus was among the injured in the morning rush-hour collision.
Footage showed the bus stopped with a smashed windscreen and emergency vehicles including police cars, ambulances and a fire engine in attendance.
Witness Emit Suker said the bus "was going really fast and came off the road."
"There were about 15, 16 people inside the bus. People were screaming – it was terrible," Suker said.
The Metropolitan Police force appealed for witnesses to send in phone or dashcam footage as it investigates. No arrests have been made.
Victoria is a major rail, metro and bus hub not far from Buckingham Palace and is usually thronged with commuters and tourists.