Three young men were arrested at Harpenden Station under suspicion of stealing a motor vehicle.
Herts police officers, including those from the Beds, Cambs and Herts Police Dog Unit, were called to the scene at 9.13pm on Tuesday, October 24, to reports of a group of young people acting suspiciously.
They detained the three young men before handing over to the British Transport Police.
The British Transport Police arrested the men, aged 19, 20 and 21, suspecting them of stealing a car.
They have since been released under investigation while enquiries continue.
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