Police say they are investigating the sexual assault of a 12-year-old girl by a masked man on a train.

The child was with her mother and sister when she was attacked last week.

The incident happened on board the 10.08am service from Balloch in West Dunbartonshire to Airdrie in North Lanarkshire at around 10.20am on Tuesday 25 July.

British Transport Police (BTP) believe the suspect boarded the train at Dumbarton Central and left at Old Kilpatrick.

The man was described as white, of medium build and average height. He had short greyish hair and was wearing a black face mask that partially covered his face.

He was wearing a black hooded jacket, black Nike trainers, and black trousers with a red stripe down the leg.

He was also carrying a black bin liner and a black rucksack.

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Investigating officers believe a passenger who was sat nearby may have witnessed the assault and are appealing for them to come forward.

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A BTP spokesperson said anyone with information is asked to call officers on 0800 40 50 40 or Crimestoppers anonymously on 0800 555 111.

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