John Kerry, the US secretary of state, has cancelled the remainder of his European diplomatic tour after breaking his leg in a bicycle crash on Sunday morning near Geneva, where he had been holding nuclear talks with Iran’s foreign minister.

The US State Department said Mr Kerry was in a stable condition but had broken his right femur in the accident and was flying back to the US. Paramedics and a physician were on the scene with his motorcade at the time and he never lost consciousness.

State Department spokesman John Kirby said Mr Kerry was expected to make a full recovery. The injury is near the site of a previous hip surgery, he said, so Mr Kerry will return to Boston’s Massachusetts General Hospital to be treated by the doctor who performed that surgery.