Officers in Wiltshire say they've had reports of it happening between Junctions 19 and 15.
Live Updates From Heart
Police say Jack Parfitt hasn't been seen for nine days.
Advice to keep cool as the temperature rises
West terminal to be extended to improve security area
Up to 20 injured after collision involving troop carriers
A Somerset mother who went on the run for 17 days with her three-year-old son faces threat of jail.
Police say they were called to Eldene in the early hours of Saturday.
Charlie is only the second armadillo to be successfully reared at the Wiltshire park.
Spectacular displays of lightning have been seen across the country this morning, as thunder and heavy downpours followed above-average temperatures on Friday.
Traffic along the Channel Tunnel has been disrupted overnight after migrants tried to enter restricted areas in Calais, according to reports.
Primary and secondary schoolchildren are being subjected to a "pressure cooker environment" in class – with many young pupils experiencing "heart-breaking levels" of exam stress, a report has warne
Gill Hicks, a survivor of the 7 July bomb attacks, has made an emotional return to Beeston - the small Leeds suburb where three of the four suicide bombers grew up.
Josh Hartnett and his British girlfriend, the actress Tamsin Egerton, are expecting their first child together.
Sam Smith has put Ellie Goulding's name forward as a contender to sing the new Bond theme tune.
Demand for the Alexander McQueen exhibition has been so high that the Victoria and Albert museum has announced it will stay open to visitors all night.
A woman who was allegedly assaulted by actor Emile Hirsch at the Sundance Film Festival described the incident as being "insanely painful and absolutely terrifying", according to public records.</p
Chris Froome has described this year's Tour de France as "very open" and believes more riders than just the so-called "Big Four" will be challenging for victory.
Serena Williams battled to a three-sets win over Britain's Heather Watson, who pushed the world number one all the way in a brilliant third-round match at Wimbledon.
Liverpool have taken advantage of a red tape row to sign a former Barcelona youth player coveted by Dutch sides PSV Eindhoven and Ajax.
Josh Hazlewood is hard-wired for Ashes victory.
A North Dakota man's self-penned, two-word obituary has been published in his local newspaper.
Aliens resembling humans must have evolved on other planets, a leading biologist has claimed.
A woman's ankles were broken when a dolphin jumped into her family's boat in southern California.
A New Jersey couple has sued the people who sold them a $1.3m house after they claim a series of threatening letters from a stalker called "The Watcher" forced them to leave the property.
Kanye West is forced to bow down to Queen after his Glastonbury festival rendition of 'Bohemian Rhapsody' gets upstaged in this hilarious video.
Journalists are often guilty of asking pointless and empty questions to famous ladies… but here are five times these correspondents were told where to stick it. Now that's girl power!
There are some things that never fail to amaze us!
We've heard of underwater gymnastics, but these youngsters are bringing new meaning to the phrase "dive right in!"
Regardless of how much mileage you have on your clock this new test claims to be able to calculate a new age for you depending on how well you've looked after yourself. This could be your chance to drop a decade in minutes!
A whopping 79% of women lie to their friends and family about the real reason they can’t go out on the town.
According to one in ten men a man's place is now well and truly in the kitchen.
Research has revealed that 85% of British men dream of an easy life.
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