A Good Samaritan told yesterday how he found himself helping at the scene of a serious road crash – just hours before he moved house.

Police are still appealing for witnesses as they try to piece together the exact circumstances of the crash, which saw a Fiat Punto clip a tree and demolish a front wall in Brasenose Avenue, Gorleston.

The four occupants of the car were all taken to hospital, the driver and one passenger with very serious injuries.

Mark Martin, 33, was spending a final night in his flat in Brasenose Avenue when he was woken at about 1am on Saturday by a loud noise.

Rushing to his lounge window overlooking the road, he saw a badly damaged Fiat Punto 'sitting in a neighbour's garden'.

He said: 'I ran outside in my boxer shorts and the driver was saying, 'help me, help me.' His front-seat passenger and one of the rear seat passengers appeared to be unconscious.'

Mr Martin, who is unemployed, dialled 999 and stayed on the line, calmly advising the control operator about the state of the casualties until a paramedic arrived in a rapid response vehicle less than five minutes later.

He said: 'Other people arrived on the scene and they were looking inside the car with torches and passing information to me so I could tell control.'

Mr Martin, who moved later in the day to nearby St Peter's Avenue, said: 'Brasenose Avenue remained closed until about 5.30am and I was getting worried about my removal van arriving at 9am.'

Firefighters were called and had to cut the roof and doors off the car before the occupants could be released and taken away by ambulance, three to the nearby James Paget University Hospital and the driver to the Norfolk and Norwich University Hospital.

Mr Martin said: 'It looks like the car must have clipped the mini-roundabout at the junction with Fastolff Avenue and gone out of control. It was the worst accident scene I have ever seen.'

Police were yesterday not releasing details of the accident victims until all relatives had been traced.

The driver, who sustained serious leg injuries, underwent surgery on Saturday and was yesterday described as still being in a critical condition. One female passenger, who suffered internal injuries, was also described as critical.

The two others in the car had less serious injuries and were likely to be discharged yesterday.

Any witnesses who saw the car prior to the collision are asked to call the police's serious collision investigation team on 0845 4564567.