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The recent discovery of a gun in a lake in eastern France could help solve the mysterious murder of an Iraqi-British family after nearly 15 years, according to French authorities.

The case of the al-Hilli family has confounded investigators for years, and no perpetrator has been identified in the 2012 killings.

What happened: British tourists discovered a Luger, a type of German pistol, while swimming in Lake Annecy in the French Alps on Aug. 20, the French magazine Marianne first reported on Monday. French police are now examining the firearm, which they say bears similarities to the weapon they believe was used in the 2012 murder, Agence France-Presse reported.