Half a league, half a league, Half a league onward, All in the valley of Death...

This is the best summary I could come up with:

Video on social media shows a grey and a black horse running through Aldwych, one with blood on its chest and legs.

One serviceman was thrown from his horse in Buckingham Palace Road and one of the loose animals collided with a taxi waiting outside the Clermont Hotel, shattering the windows.

The BBC understands the noise of builders in Belgravia caused the horses of the Household Cavalry to bolt and unseat the riders.

London Ambulance Service says four people were treated by paramedics in Buckingham Palace Road, Belgrave Square, and the junction between Chancery Lane and Fleet Street.

Black cab driver Robbie told BBC Radio London he narrowly avoided being hit by the horses.

He added he "nudged out a little bit more" to check it was safe to pull out, and then "another horse came round the corner with a rider on it and just missed my cab and then he disappeared off".

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