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'Unexplained' DNA on dead spy bag

24 April 2012 Last updated at 19:43 BST

Specks of unexplained DNA were found on the holdall containing the curled-up body of MI6 spy Gareth Williams, his inquest has heard.

The body of Mr Williams, 31, originally from Anglesey, was found locked in the bag in the bath of his London flat.

Det Ch Insp Jackie Sebire said "two minor components of another contributor's DNA" were found on the zip toggle and padlock.

She said it was her opinion "that a third party had been involved".

Gordon Corera reports.