The accident happened at around 8.45am on the eastbound carriageway just past the off slip road of junction 27. Motorists are still facing delays of up to an hour as traffic has built up past Huntingdon. The westbound carriageway was closed for a short time for the firefighters to reach the scene. Firefighters cut free a trapped person from there car. Five of the cars involved were two Vauxhall Astras, a Citroen Blingo, a blue Ford Focus and a Volkswagen Golf. A Cambridgeshire police spokesman said there were some slight injuries and officers were waiting for recovery of the vehicles before the road was reopened. The Highways Agency said the road was reopened at 11.10am. More details to follow.