Around 1.10pm, a Mercedes A45 collided with an unmarked Volvo S90 police car and a Mercedes CLS, which were on the hard shoulder of the eastbound carriageway. 

Two male police officers and two men from the Mercedes CLS were taken to hospital following the crash.

A 48-year-old police officer and a 43-year-old man remain in a critical condition.

A 38-year-old police officer and a 31-year-old man have both been discharged from hospital following treatment.

Three men, aged 27, 33 and 39, were travelling in the Mercedes A45 at the time of the collision. The 27-year-old and 39-year-old left the scene but were traced nearby following enquiries. All three were taken to hospital for treatment.

The 39-year-old remains in a critical condition. The 33-year-old is still being treated for serious injuries.

The 27-year-old was discharged from hospital and arrested in connection with road traffic offences. He was released pending further enquiries but has since been arrested and charged in connection with an unrelated matter. He is being held in custody and expected to appear at Glasgow Sheriff Court on Friday, 26 July, 2024.

The eastbound carriageway was closed for around 12 hours to allow enquiries to be carried out at the scene.

Chief Superintendent Hilary Sloan, Head of Road Policing for Police Scotland, said: "Our thoughts remain with our colleagues and members of the public who were injured in this incident.

"The collision occurred on a busy part of the M8 during the middle of the day. I am appealing to anyone who saw what happened or has information, and has not already spoken to officers, to please come forward.

"Additionally, please contact us if you have any dash-cam or CCTV footage relating to this incident that could assist our investigation.

"Extensive enquiries are ongoing to establish the full circumstances of what happened."

Information can be passed to Police Scotland by calling 101 and quoting reference number 1672 of 24 July.

As is standard procedure following an incident of this nature, the matter has been referred to Police Investigation & Review Commissioner (PIRC) for review and we are therefore unable to comment further on the circumstances at this time.