One woman has died after a minibus carrying women to a hen party was involved in a crash with a lorry.
The minibus was on its way to Liverpool when it was involved in the collision at junction 32 of the westbound carriageway of the M62 near Pontefract at about 11.30am on Friday, leaving some 19 people injured, six seriously.
The driver of the lorry, believed to be a local man, has been arrested in connection with the incident, West Yorkshire Police said.
Speaking at the scene, Chief Inspector Mark Bownass said emergency services were called to a report of a collision between a large goods vehicle and a minibus from South Elmsall, near Pontefract: He said: "We believe the minibus at this time was heading to a hen party in Liverpool. Sadly within this accident there has been one fatality."
Chief Inspector Bownass said there had been disruption to the motorway, but it will hopefully be reopened soon. He appealed for any witnesses to contact police on 101, as well as any family members who may have any concerns.
Six air ambulances were called to the scene but four were actually used by emergency crews who came to treat casualties.
Assistant Chief Fire Officer Dave Walton said that firefighters had remarked that the crash was "the worst they had seen in a number of years".
Chartered accountant Pritpal Singh, 28, from Leeds was travelling back to his office on the M62 westbound when the accident happened.
"It was about 11.30am, I was going in the same direction as the accident, the westbound carriageway. It was effectively gridlocked from 11.30am onwards. By noon everyone had shut off their engines and started walking around on the road. By 2-2.30pm three quarters of the cars and lorries were empty.
"I was about a third of a mile back from where the accident was, I got out and walked up to the scene. I could see a minibus which was on its side. It had quite a severe amount of damage on the right hand side. he lorry which had collided with it was on the main motorway."