Racing was abandoned successful the Track Champions League astatine Lee Valley VeloPark successful London aft British Olympic champion Katy Marchant and different rider crashed implicit the barriers into the crowd.
Marchant and German rider Alessa-Catriona Propster near the way astatine velocity on with their bikes and collided with spectators.
British Cycling said the 2 riders and 4 supporters were treated by lawsuit medics and Marchant was taken to hospital.
In a statement, British Cycling added: "WBD Sports, British Cycling, Lee Valley VeloPark, and the Union Cycliste Internationale unanimously decided to suspend each further racing for the evening and privation to widen their champion wishes for a speedy betterment to some riders and each affected spectators.
"We are moving intimately with each parties to reappraisal the incidental earlier taking due action."
At the aforesaid venue astatine the 2022 Commonwealth Games a high-speed collision involving respective riders resulted successful England's Matt Walls being catapulted implicit the barriers into the assemblage with his bike.
The London venue installed a 1.4-metre barrier, costing £250,000, astir the way this year.
Thirty-one-year-old Marchant, who won Team Sprint golden astatine the 2024 Paris Olympics, was competing successful the 2nd vigor of the women's keirin.