"Many vehicles were on fire and the collision itself involved what we believe to be about 27 vehicles - both lorries and cars. So they were faced with virtually all of them on fire. Many of them have burnt literally to the ground."
Emergency crews said they believed the weather may have been a contributory factor in the crash, on the northbound carriageway, and witnesses described seeing thick fog at the time.
Earlier, part of nearby Bridgwater town centre was closed off amid fears a wall could collapse after heavy rain.
Paul Slaven, of Devon and Somerset Fire Service, said crews were now "damping down" at the scene.
He said: "There is a large amount of debris covering the road and a couple of vehicles are still smouldering after being on fire so the police have said the road will be closed for at least 24 hours and possibly more for the carriageway to be cleared."
The fire service said there had been 20 "light vehicles" involved in the incident, along with six articulated lorries.
'Black smoke'
Motorist Steven Swift, who passed the accident scene while heading south about 30 minutes after the crash, said he had seen three lorries on fire and some injured people lying in the central reservation.
He added: "It was a horrific scene. The heat was intense."
Bev Davis, who had been in a field near the motorway looking after her horses, said: "There was this horrific sound of a horn. The horn was just permanent.
"You knew something had gone on and then the flames were just so high so quickly and the noise was horrific. And then there were explosions, I think probably of tyres going."
f**k.
http://www.guardian.co.uk/uk/2011/nov/05/m5-crash-feared-dead-collision?newsfeed=truehttp://www.independent.co.uk/news/uk/home-news/at-least-six-dead-in-horrific-crash-on-m5-motorway-6257640.htmlhttp://www.bbc.co.uk/news/uk-england-somerset-15603124M5 Crash Footage - Sky News Coverage 04/11/2011 BREAKING NEWS PILE-UPBreaking News - M5 CRASH - Live Footage- Many Casualties And FatalitiesThe date when it happened was the 5/11/11, the number of cars involved is 27 11+11+5 = 27. Freaky.
This is the worst car crash in British history.
RIP
http://news.sky.com/home/uk-news/article/16103826 > Live updates.