​Key Details: 

• Laurent Bonomo and Gabriel Ferez, French biochemistry students, were interning at Imperial College London.

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• They were last seen on June 28, 2008, on CCTV at Canada Water tube station and at McDonald's in Surrey Quays shopping centre.

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• On June 29, 2008, a fire broke out at Laurent's flat in New Cross, reported by neighbours after a loud bang.

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• Firefighters found the bound and brutally stabbed bodies of Laurent (194 stab wounds) and Gabriel (47 stab wounds) in their underwear, revealing a deliberate and vicious attack.

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• The perpetrators, Dano Sonnex and Nigel Farmer, had burgled Laurent's flat a week prior, stealing a laptop.

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• The attack began around 5:30am when Dano and Nigel, under the influence of drugs and alcohol, broke into the flat seeking debit card PINs.

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• The assailants tortured and killed Gabriel first when his card failed to work, followed by Laurent in a prolonged and brutal attack.

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• They set the flat on fire to destroy evidence but were seen by a neighbour, leading to a description and artist's impression.

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• Nigel Farmer, suffering from severe burns from the fire, turned himself in to the police, while Dano was later arrested hiding in his grandparents' attic.

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• Both men blamed each other during the trial, but the evidence showed their joint involvement.

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• They were convicted of double murder and sentenced to 40 years (Dano Sonnex) and 35 years (Nigel Farmer).

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• The Justice Secretary apologized for the oversight that allowed Dano to be free at the time of the murders.