| Hosts: Birmingham Dates: 28 July to 8 August |
| Coverage: Watch live on BBC TV with extra streams on BBC iPlayer, Red Button, BBC Sport website and BBC Sport mobile app; Listen on BBC Radio 5 Live and Sports Extra; live text and clips online. |
Walls and his bike flew into the crowd after he crashed at the Lee Valley veloPark.
The man was taken to hospital after being treated in the stands for more than an hour.
One of the spectators was covered in blood and taken away in a wheelchair.
The Isle of Man's Matt Bostock was hospitalized.
Spectators were asked to leave the venue after the rest of the session at the velodrome was abandoned.
Walls won two medals for Team Great Britain at the Olympics in Tokyo.
Medics and coaches rushed to the track side after several riders crashed on the last lap. A coach from England climbed up the bank to get to Walls.
There's more to come.
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