Four motorbikes have been stolen over the weekend.
The incidents took place between Friday, November 11, and Monday, November 14, in the Hemel Hempstead area.
Two attempted thefts were also reported.
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Three of the four vehicles have since been recovered, and Hertfordshire police have urged motorcyclists in Dacorum to review their security.
PC Jake Smith said: "We’re increasing patrols and responding quickly to any reports of suspicious activity and would encourage people to call 999 straight away if they think a vehicle crime might be in progress.
“Alongside this, we’re urging people to please review the security of their motorbikes and mopeds, to ensure they don’t become a target for thieves.
“Use a disc lock to help secure the front brake disc, or a grip lock to secure the brake and throttle controls.
"You could also use a ‘D lock’ on the front wheel to stop it being wheeled away.
"Consider fitting an alarm system and use a cover, as this will provide an extra obstacle for thieves.”
Information can be reported online at herts.police.uk/report or by calling 101.
Anonymous information can be given to the independent charity Crimestoppers on 0800 555 111 or via crimestoppers-uk.org.
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