A man is fighting for his life after suffering an unexplained head injury near Dumbarton East train station.

The alarm was raised by a concerned resident, and police found the 46-year-old on Saturday at around 4.45am at the rear of shops on Glasgow Road.

He was found with a serious head injury.

It is unknown how the victim sustained his injuries, and he is currently in the Royal Alexandra Hospital in Paisley where medical staff describe his injuries as life-threatening.

Police are desperate to retrace the man's steps and have issued a call to any witnesses to come forward.

He is described as white, 46 years of age, 5ft 8in, of medium build and was wearing a beige jacket with a hood, grey t-shirt, jeans and navy trainers.

Detective Inspector Scott Hamilton, Clydebank CID, said: “At this time we do not know how the man sustained his injuries, however, what we do know from our enquiries is that he left the Stags Head Public House, Glasgow Road, Dumbarton, around 1.20 am.

"He is then seen on CCTV half an hour later, around 1.50 am, walking in the area of Dumbarton East train station, Glasgow Road, Dumbarton.

“It is essential that we trace his movements from leaving the pub at 1.20am to him being found on Saturday morning around 4.30am.

"So, I would ask anyone who may have seen a man fitting his description between those times on Saturday morning to contact the police."

Anyone with information is asked to contact Clydebank Police Office on 101, quoting reference number 0823 of June 1 2019.