A coach reportedly carrying a group of Welsh teenagers has crashed in France near the Swiss border.
Fifteen people have been injured and two of them seriously, according to local reports.
A Foreign Office spokesman said: "We are providing support to a group of British nationals following a coach crash in France. We are in contact with the relevant local authorities."
It is thought the coach was making its way to Italy before the accident took place on the A39 motorway at Lons-le-Saunier.
Twitter account Infos Francaises posted: "Serious accident a bus carrying children on A39."
The same account posted that 15 people had been injured, two of them seriously.