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Detectives believe an MI6 spy found dead in a padlocked bag was killed by agents who broke back into his flat after the body was found to cover their tracks.

Mystery has surrounded the death of Welshman Gareth Williams ever since his body was found inside a padlocked bag in his central London flat in 2010.

The Met Police concluded Mr Williams, from Valley, near Holyhead on Anglesey, is most likely to have died alone after locking himself in the holdall.

But detectives who probed his mysterious death believe agents may have broken back into his flat through a skylight to destroy evidence to cover their tracks after his body has been moved.

According to the Mail on Sunday, a source ‘at the heart of the investigation’ is said to have claimed forensic equipment placed in the flat was removed, despite the fact the property was under armed guard.

The source said special footplates - which allow officers to walk across the crime scene without contaminating evidence - appeared to have been moved on the first day of the investigation.

MORE: MI6 spy Gareth Williams killed by foreign agents, claims security expert

Detectives concluded someone must have scaled the walls of the building and climbed in through the skylight to get access to evidence left behind.

It supports Mr Williams’ family’s theory that he was murdered by secret service agents.

The claims also tie in with a coroner’s inquest into the death which said he was “unlawfully killed”

But a Scotland Yard review into the death of Mr Williams – who had a wardrobe full of women’s clothes - said he was likely to have died alone and may have been taking part in a lone sex game.