A bus driver involved in the bus collision in Brighton in which 23 people were injured reported feeling unwell at the start of his shift, it has emerged.
Bosses at Brighton and Hove Buses revealed that the driver's supervisor advised him not to work when he reported sick, but he later told a second supervisor that he felt fit to drive.
The driver appears to have fallen ill again before his double-decker bus crashed into another bus in Brighton city centre.
Martin Harris, managing director of Brighton and Hove Buses, said it appeared the driver had no previous history of the illness.
We have been advised subsequently that investigation into the cause of our driver feeling unwell at this point indicates a condition of which he had no previous history.
Suggestions that the driver was pressured by the firm into working after earlier feeling unwell were "unfounded", the company said in a statement.
An investigation by the firm found no technical faults with the No 5 bus involved in the crash.
One man remains in a life threatening condition after the Brighton bus crash earlier today.
The unnamed man is being treated at the Royal Sussex County Hospital and his next of kin are aware of his injuries.
A total of 19 patients were taken to the Royal Sussex County Hospital in Brighton and the Princess Royal Hospital in Haywards Heath. All but eight of the patients have been discharged. Their injuries are not life-threatening.
Inspector James Biggs, of Sussex Police, said it was too early to say whether a medical episode suffered by one of the drivers was to blame for a crash which left 23 people injured.
As you can appreciate, on a sunny day in Brighton there were lots of people everywhere. It was very chaotic. The main priority was care for the patients.
It was declared a major incident very early on. We got a very good response from the three emergency services, and we worked very well in the initial stages to make sure the patients got the care and treatment that they needed.
This footage shows the immediate aftermath of the Brighton bus crash in which 23 people were injured.
Video credit: William Goodfield
ITV Meridian's Andy Dickinson reports from the scene of the bus crash in Brighton:
Footage captured by Press Association reporter Tom Pugh shows the aftermath of a collision between two buses, which left 23 people - including two with life-threatening injuries - wounded.
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Twenty-three people have been injured in a crash between two double-decker buses in Brighton, South East Central Ambulance Service has confirmed.
Two men suffered life-threatening injuries in the collision which occurred at 9.22am this morning in North Street.
Winding down now from Brighton bus incident. Our clinicians have treated 23 patients in total, with 7 ambs, 6 response cars, air amb & HART
7 patients taken to Royal Sussex County Hosp inc 2 with very serious injuries. 6 further patients taken to Princess Royal in Haywards Heath
Caroline Lucas, the MP for Brighton Pavilion, has thanked the emergency services for the "rapid response" to a major bus crash in the city centre.