Police in East Lothian are appealing for witnesses following a collision between two pedal cycles in Gullane.
The incident happened around 5.40pm on Saturday, June 14, in Main Street.
A tandem bicycle, which was being ridden by a 49-year-old man and 54-year-old woman, was travelling west along the A198 when it became involved in a collision with a single-rider bicycle that was travelling in the same direction.
As a result, the tandem riders fell to the ground, with the woman suffering multiple injuries.
She was initially taken to the Royal Infirmary of Edinburgh before being transferred to the Western General Hospital where she remains in a serious condition.
The man suffered minor injuries and was taken to hospital before later being released.
The 16-year-old boy, who was riding the other bike, was uninjured.
Road Policing Officers attended and closed the road for three hours while they carried out an investigation at the scene.
Anyone who can assist police with their enquiries is asked to come forward.
Sergeant Neil Inglis said: “We are still trying to establish exactly what has happened to result in this serious injury collision and would like to hear from any motorists or members of the public who were on Main Street at the time.
“In addition, anyone with any further information relevant to this investigation is also asked to contact police immediately.”
Those with information can contact Police Scotland on 101.