A woman was pulled along a platform after her hand was caught in a train door.

The incident occurred on a London Overground service at Wood Street station in Walthamstow on the morning of January 14.

The Rail Accident Investigation Branch (RAIB) says the woman was attempting to board a train at 8.22am but as she did, the train's doors closed.

The train began to depart but the woman's hand was caught in stuck in the door of the fourth carriage.

She began running along the platform alongside the train where it travelled for 20 metres before the doors were released and she was able to free her hand, after the train driver spotted her on CCTV.

It was reported that the passenger did not sustain any injuries because of the incident.

The train, operated by Arriva Rail London, had come from Chingford and was heading for Liverpool Street station. The trains are run entirely by the driver with no conductor present.

Transport for London (TfL) says Arriva Rail London is undertaking a full investigation into the incident and fully co-operating with the RAIB.

TfL has apologised to the woman involved.

Rory O’Neill, TfL’s general manager for London Overground, said: "We're sorry that our customer experienced this incident, which must have been extremely upsetting for them.

"While thankfully there were no physical injuries in this rare incident, we're committed to running the safest network possible and a thorough investigation is underway to help prevent this happening again."

The RAIB says it has undertaken a "preliminary examination into the circumstances surrounding this incident" and having assessed the evidence which has been gathered to date, it has decided to publish a safety digest, which will be made available on its website in the "near future".