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A ticket collector was punched twice in the face by a teenager on a train in West Dunbartonshire.

The attack happened after he asked the youth and his friend to leave the train because they did not have tickets.

British Transport Police are appealing for information about the assault which happened at about 18:25 on Monday between Balloch and Singer.

The ticket collector was not badly injured but was said to have been left badly shaken.

The youths were described as being about 16 years old. One was about 5ft 5in tall, with short dark hair.

He was wearing a blue hooded top and blue jacket, black gloves, bright blue jogging bottoms and black and grey Nike Airmax trainers.

The second was about 5ft 7in tall, with a shaved head. He was wearing a grey hooded top, dark jacket, dark tracksuit bottoms and dark trainers.

Investigating officer Det Con David Merchant said: "We're investigating this incident fully and are determined to catch those responsible.

"It is disgraceful to think that someone can be attacked simply for doing their job - and so, if you know the men who did this, I urge you to get in touch."