Video of lorry fire on the M4 between Swindon and Chippenham.
Emergency services were called out on Thursday to what they described as a "substantial vehicle fire".
Eugene Reilly saw the blaze took hold:
The main carriageway re-opened, but the carriageway surface needs further inspection.
Police have confirmed they have found a body in the search for missing mother Susan Weston from Chippenham.
The body of a woman was found in woodland near to the village of Box at 10.45 this morning.
Although formal identification has not yet taken place, police say they believe it to be the body of the 58-year-old who went missing on Monday.
Police do not believe there to be any suspicious circumstances surrounding her death. In a statement they said:
We would like to thank everyone who has shared the appeals for Mrs Weston over the past two days."
"Our sincere thoughts are with the family and friends of Mrs Weston at this extremely difficult time."
Police are becoming increasingly concerned for a woman from Chippenham, who went missing 24 hours ago.
Susan Weston, 58, was last seen on Monday near home in Cepen Park South. She's not been seen or heard from since.
Wiltshire Search and Rescue have joined the search, which is focussing on the area of Corsham and Box.
Mrs Weston is described as white, approximately 5 ft 3 inches tall with light brown shoulder length hair. She was last seen wearing a black coat, black boots, a quilted top and dark coloured tights.
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Wiltshire police have arrested a lorry driver on suspicion of being involved in people trafficking. The man was arrested on Saturday afternoon after more than 20 men were found in a lorry at a truck stop near Chippenham.
The men, all from Afghanistan and Iran, were arrested on suspicion of entering the country illegally. and are now in the care of the Border Agency. The driver, a 26 year old Romanian man, has since been released on bail.