Cyclists taking part in the 100-mile RideLondon event have been diverted after an air ambulance was called to deal with an incident on the route.
Thousands are taking part in the ride, which set off from London on Sunday morning and follows a route into Surrey.
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The incident, which some on social media suggested was a crash, resulted in riders being temporarily halted.
Organisers tweeted: "Due to an incident that required an air ambulance to attend, riders in the RideLondon-Surrey 100 have been held on the route in Surrey.
"Planned contingency route from West Byfleet to Ripley is being opened & riders will be directed to that route. More info when available."