A Scottish woman has been confirmed as one of two passengers killed in a coach crash near Heathrow Airport.
Fire crews had to cut passengers from the wreckage
Chris Toner, 76, from Monifieth, Dundee, died when the London to Aberdeen National Express overturned on a slip road from the M4 to the M25.
The driver of the coach has been arrested on suspicion of causing death by dangerous driving.
A couple from Skye were among those taken to hospital following the incident at 2345 GMT on Wednesday.
Mrs Toner's husband Jimmy, who played for Dundee and Leeds in the 1950s, also suffered a head injury in the accident.
The 69 people on board the bus were taken to hospital.
National Express said it was likely many of the passengers on the No 592 service were returning from holiday, with the majority heading to Glasgow.
It departed London Victoria at 2230 GMT and was due to arrive in Aberdeen at 1030 GMT, stopping at Heathrow Airport, Carlisle, Hamilton, Glasgow and Dundee.
A National Express spokeswoman told BBC Scotland that actual bookings for the journey were 75 for Glasgow - with 49 of them on another coach - 23 for Aberdeen, 19 for Dundee, six for Hamilton and three for Carlisle.
A number of people on board were Polish nationals.
Graham Groves, of South Central Ambulance Service, was among emergency crews who were the first at the scene of the crash.
He said: "They were confronted with quite an horrific scene, there were six immediately, obviously trapped and six other patients with other very serious injuries."
Some of those involved lost limbs in the crash.
David McVittie, chief executive of Hillingdon Hospital, in London, said 36 people were brought to the hospital, of which 21 had been successfully treated and discharged.
Mr McVittie said: "Of those that remained, two sadly died in the early hours of this morning and three remain seriously unwell.
"The remaining patients are on wards waiting for surgery."
Of the three seriously injured victims, one has head injuries and is having a limb amputated, another also has head injuries and the third has spinal injuries.
Distraught relatives and friends have been gathering at the hospital to await news of their loved ones.
Trauma consultants at the hospital said the patients were clearly thrown or dragged along grass or mud because there was heavy contamination of all of the wounds.
National Express stressed that they did take safety very seriously and that coaches were fitted with seat belts and safety notices for passengers use.