Two people have been taken to hospital after part of a stand collapsed during a rehearsal for Trooping the Colour.
Five people were treated following the incident on Saturday as a crowd watched the event at Horse Guards Road in central London.
Witnesses described hearing a "loud bang and then a scream" and someone falling through the stand.
Two people were taken to a major trauma centre "as a priority", London Ambulance Service said.
Three others were treated by paramedics and were discharged at the scene following the incident at about 11am.
An Army spokesman said two parts of the viewing stand "gave way" and that work was under way to determine the cause of the incident.
They added: "The emergency services were called to assist those who were injured and the remaining crowds were safely evacuated from the stands.
"Safety is our number ...
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