A 'SERIOUS CRASH' is now being treated as an attempted murder.

A man in his 30s is fighting for his life following a crash in Waterloo Road, Southampton.

He and a woman in her 40’s had been riding a bike which collided with a white Citroen Berlingo 625 En-Prise.

Both were rushed to hospital, however, the man’s injuries have since become life-threatening and he remains in hospital in a critical condition.

The Citroen is reported to have fled the scene following the incident just before 9.50pm on Friday, July 17.

Officers investigating the "serious collision" are now looking at the incident as an attempted murder.

Police are keen to identify the driver of another van, possibly a Fiat Scudo, who stopped at the scene immediately after the incident.

A police spokesperson said: "We believe this person may have vital information that will assist with the investigation.

"We would urge this person, and anyone else who saw what happened, to contact us as soon as possible by calling us on 101 quoting 44200266371.

"Alternatively people can call Crimestoppers anonymously on 0800 555 111."

A 33-year-old man from Southampton has been arrested on suspicion of attempted murder, causing serious injury by dangerous driving, GBH, failing to stop after an accident and criminal damage.

He has been released on police bail while enquiries continue.