Coach passengers are being urged to contact police if they have been the victim of a sexual assault.
The call comes after a 23-year-old-man was arrested and charged in connection with two sexual assaults that took place on coaches.
He was arrested at the Rothersthorpe service station on the M1 at junction 15A after an allegation of a sexual assault was made on April 28.
He was charged in connection with that assault and another that took place on a bus on the A1 in Yorkshire in January 2013. He appeared before Northampton Magistrates’ Court on April 29.
Police would like to speak to anyone who may have any information about sexual assaults that have taken place on coaches travelling across country in the last 18 months.
Witnesses or anyone with information is asked to contact Northamptonshire Police on 03000 111 222.