An investigation is set to find out what caused a tragic train derailment, which killed three people and injured another six. 

The early morning Aberdeen to Glasgow Queen Street service crashed near Stonehaven yesterday morning after heavy flooding and rain. 

It is known the train driver, the conductor and one passenger are among the dead. 

British Transport Police (BTP) bosses confirmed an investigation would be lead by the Crown Office and Procurator Fiscal Service (COPFS).

The BTP will work closely with them, the Rail Accident Investigation Branch and the Office of Rail and Road to establish the full circumstances. 

Emergency services raced to the scene in Stonehaven around 9.40am on Wednesday - including an air ambulance. 

READ MORE: Three tragically pronounced dead after Glasgow-bound train comes off tracks in Aberdeenshire

Glasgow Times:

BTP Chief Superintendent Eddie Wylie said: "I would like to reassure the public that this was not a busy service, and from CCTV enquiries and witness statements we believe all passengers have been accounted for.

"However, once the area has been made safe then a full and thorough search will be conducted, which is likely to take some time.

"I know many people will understandably have questions, and the investigation will be directed by the COPFS. We will be working closely with them, alongside the Rail Accident Investigation Branch and the Office of Rail and Road to establish the full circumstances of how the train came to derail.” 

UK Transport Secretary Grant Shapps and the Scottish Government’s Michael Matheson will both visit the area on Thursday and meet members of the emergency services.

Ahead of the visit, Mr Shapps said: “I express my deepest condolences to the friends and families of those affected in the tragic incident near Stonehaven.

“My department is in close contact with all relevant parties, including our counterparts in the Scottish Government, to provide any support that is required.

“I want to pay tribute to the emergency services and rail workers, who have responded so quickly in these distressing circumstances.

“The safety of passengers and staff is and has always been our upmost priority and we will ensure that lessons are learned from this tragic incident once the Rail Accident Investigation Branch has carried out its investigation.”