Eleven motorbikes have been stolen during a spate of Watford thefts that has sparked a fresh police warning.

They happened around the area during the last four weeks and are believed to be "opportunistic", according to Hertfordshire Police.

Most were overnight or in the early hours of the morning with thieves appearing to be using cutting tools.

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"No particular pattern" has been identified following the thefts, a spokesperson for the force said.

Officers have warned that "thieves only need a matter of seconds to steal a moped, scooter or motorcycle", and have advised owners to secure their vehicles.

Chief Inspector Andy Wiseman said: "I would urge people to follow some simple crime prevention tips – many of the stolen motorcycles were left unsecured.

                                                                                            

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"If nothing else, always lock your bike and set the alarm if it has one.

"If you witness suspicious activity around motorcycles, I would urge people to report it by calling 999 so that we can attend.”

Information on keeping vehicles safe can be found on the Hertfordshire police website: www.herts.police.uk.