The 45 year-old woman who died in the crash between a double decker bus and a 4x4 jeep, has been named.
Andrea Harris, died at the scene of the accident and it has left six people still in hospital.
The crash, involving a Stagecoach double decker and an Isuzu 4x4, took place around 2pm on Monday in Ardrossan, North Ayrshire.
The 48 year old driver of the 4x4 and the 36 year old bus driver are said to be serious but stable, in Glasgow's Queen Elizabeth University Hospital.
Four bus passengers, two men and two women, are also still in hospital - they were taken to Crosshouse Hospital for treatment.
A further five passengers on the bus received medical treatment at the scene.
Two air ambulances attended the fatal crash after paramedics declared the situation "serious".
A stagecoach spokeswoman said: "Our heart goes out to the family of the woman who dies in yesterday's road accident near Ardrossan.
"Our thoughts remain with all those affected by the incident, including our driver and others who were taken to hospital.
"We will continue to support the police in any way that we can in their investigation into the detailed circumstances involved in the accident."
Stagecoach confirmed the bus was fitted with CCTV technology and footage of the incident has been passed to the police.
The A78 road was re-opened on Monday night after being taped off for seven hours.
Police Scotland told media: "Extensive enquiries are ongoing into the cause of the crash, at this time I would urge anyone who witnessed the crash, who has not yet spoken to police, or anyone with information that may assist our investigation to contact us through the non-emergency number 101."