"Specialist tools" have been used during a theft in Danesgate, Stevenage.
An electric bike was stolen from the car park for Stevenage Leisure Centre between 7.05am and 6.30pm on Wednesday, September 6.
Hertfordshire police have now released a CCTV image of an individual that they would like to identify.
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PC Chris Pickering said: "Our enquiries are continuing, and I am appealing for any witnesses to please come forward with information.
“We are releasing this image because we believe the individual pictured may have been in the area at the time and could have information to assist our investigation.
"Is this you, or do you recognise this person?”
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PC Pickering can be contacted via email at: chris.pickering@herts.pnn.police.uk.
Information can also be reported online at www.herts.police.uk/ro/report or by calling the police's non-emergency number 101, quoting crime reference 41/71504/23.
Anonymous information can be given by contacting Crimestopppers on 0800 555 111 or via crimestoppers-uk.org.
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