The US Secretary of State, John Kerry, has been airlifted to hospital after a bike crash in the French Alps, but his condition is believed to be stable.

Kerry was flown to Geneva University Hospital by helicopter with a leg injury after the incident in the Haute-Savoie region, according to the Independent.

The newspaper reports Kerry did not lose consciousness following the crash near Scionzier in the French Alps, and was being accompanied by a motorcade that included paramedics and a doctor.

The Secretary of State has been in Switzerland for Iran nuclear talks in Lausanne, which are expected to last for another month. A keen cyclist Kerry, 71, was spotted on his bike in Switzerland in March during the talks, when he suffered mechanical problems on his 10-year-old road bike and received a police escort to a local bike shop.

He was spotted later in the month in a Lausanne bike shop with further mechanical issues, both apparently related to the gear shifter mechanism.

It hasn't been confirmed whether or not talks will be delayed by the accident.