There's been a crash involving a coach and three cars on the Walton Park roundabout in Milton Keynes.
According to the police, four people have been taken to Milton Keynes hospital after the incident, which happened at about 3.10pm on Friday, and involved around 30 people.
Fire crews from Bletchley, Broughton, Great Holm and Newport Pagnell helped release passengers - some of whom were injured. Paramedics were also on the scene.
Three men and four children were released, injured, before emergency crews arrived. Fifteen children had got out of the wreckage unhurt.
Most of the road closures have now been lifted but the H10 westbound is still closed and traffic from the H10 and V11 is being diverted through Tillbrook.
The vehicles involved were a black Ford Mondeo, a grey BMW, a silver Mercedes and a blue Iris bus.