Thieves in Sheffield have stolen an electric bike used to help a disabled boy.
The bike was parked outside the Orthodontic Centre on Ecclesall Road on Monday when it was taken.
Lorraine Reuber said her 16-year-old son Leon, who is wheelchair bound, is pulled around behind the bike in a trailer.
She said the family is 'absolutely distraught' at the theft.
"Leon has many disabilities and is confined to a wheelchair. However, he loves being pulled in his trailer and feeling the wind in his face. In fact, being pulled in his bike trailer is one of the few activities Leon really enjoys," she said.
"We bought the electric bike last year because Leon had become too heavy for us to pull with an ordinary pushbike.
"We bought an electric mountain bike to cope with the load we were pulling but we adapted the bike in many ways. It has mudguards, special grips, stand, luggage rack, lights and a connection piece we need to attach the trailer we use to pull Leon.
"We are absolutely distraught that this bicycle has been stolen. We have not given up the hope that somebody will be decent enough to return the bike to us or provide us with information about where we can find it.
"This bike will not simply be replaced by insurance. This is a huge loss for Leon and our whole family."
The bike is a 29-inch Cube with a Bosch electric engine, battery and control panel.
Anyone with information should call South Yorkshire Police on 101.