Investigations were today ongoing to establish why a train carrying 31 passengers from Great Yarmouth to Norwich collided with a stationary train as it approached Norwich train station.

The crash is being investigated by the Railway Accident Investigation Board (RAIB) who attended the scene together with police, paramedics and firefighters.

In total, six ambulances and nine fire crews attended Norwich train station where they joined British Transport Police officers as well as Norfolk police officers following the crash at about 12.20am on Sunday. It happened as the 11.34pm Yarmouth to Norwich train was pulling into platform six where it was involved in a crash with a stationary East Midlands Train which was empty.

A spokesman for the RAIB today said 'investigations are ongoing' into the cause of the crash although they could not say how long that process might take.

A Greater Anglia spokesman said: 'Following the incident at Norwich station early on Sunday morning involving the 23.34 Saturday service from Great Yarmouth, we are continuing to work closely with the Rail Accident Investigation Branch as part of their investigation and we will review the outcome of this process when it is concluded.'

Meanwhile, a spokesman for the British Transport Police (BTP) said they were still looking for any witnesses to what happened to come forward.