Sky News has obtained CCTV footage showing a man understood to be Ali Harbi Ali walking along a north London street just hours before the killing of Conservative MP Sir David Amess.

The 25-year-old man, who has been arrested on suspicion of the murder of Sir David Amess, is seen walking slowly along the pavement on Friday morning.

With a backpack across his right shoulder he is seen wearing a green parka jacket and spectacles, with his hand in his left pocket.

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