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Thousands of names and addresses belonging to UK customers from a leading website for buying and selling shotguns and rifles have been posted on the dark web following a security breachite ".
Guntrader.uk told Hfrance.fr that he learned of the breach on Monday and informed the Information Commissioner's office.
Police, including the National Crime Agency, are investigating.
An affected gun owner said he feared the violation would lead his family to be the target of criminals.
Gun ownership is tightly controlled in the UK, making guns difficult to acquire and potentially valuable on the black market.
L 'individual, who did not wish to be named, told Hfrance.fr that the violation "seriously compromises my safety arrangements for my firearms and puts me in a situation where my family and I could be targeted and in danger ".
Guntrader.uk said around 100,000 customer records were stolen but " no information relating to gun possession or gun locationwas taken ".
Nevertheless, the stolen data will include many people who own firearms, and shooting organizations urge caution.
The British The Association for shooting and Conservation (BASC) urges its members "to be vigilant about home security " following the breach.
In a statement posted on its website, it said that personal data had been listed on "on a hacker website ".
"Our advice to members would be to check home security and be extra vigilant. Make sure all guns are properly locked and buildings are secure, "he writes.
Breach investigation led by South West Regional Cyber Crime Unit (SWRCCU).
He is assisted by the National Crime Agency who told the Hfrance.fr: "We are working closely with the organization [guntrader] and SWRCCU to better understand the incident and manage any potential impact.
Police reiterated safety advice to hunting rifle owners and urged them to report any suspicious activity.
BASC told Hfrance.fr that gun laws require that firearms are securely locked up when not in use, adding that the majority of police forces will come out and check your safety measures before issuing a firearms certificate.
Simon Baseley of Guntrader told Hfrance.fr that he has advised users to be vigilant, and is working closely with relevant agencies to mitigate the impact.
He has says it was the first time in 20 years that an attempt to bypass company security had been successful.
"All inSignals currently indicate that the violation was neither political nor commercial as there was no attempt to extort money from guntrader.uk or its users, or derive other capital from the theft ”, he added.