Officials are investigating an incident in which a traveller on the London Underground was dragged along a platform after her scarf became caught in a train door.
The woman, whose scarf was wrenched off by the train, suffered back and head injuries in the incident at Holborn Underground station in central London.
The woman had moved towards a Piccadilly line train at the station, but stopped as she realised the doors were closing.
The Rail Accident Investigation Branch, which is looking into the incident, said: "As she stopped, the end of the scarf that she was wearing continued to swing towards the train and became trapped between the closing doors.
"The train operator was unaware that the scarf was trapped in the door and after confirming that all doors were closed, started to move the train into the tunnel.
"The passenger was dragged along the platform by her scarf as the train started to move. The station assistant tried to help the passenger by holding on to her and they both fell to the ground.
"This resulted in the scarf being forcibly removed from the passenger's neck and carried into the tunnel by the train."
The RAIB said: "The passenger suffered injuries to her neck and back and was taken to hospital; she is now recovering.
"The RAIB's investigation will seek to understand the sequence of events and will examine the arrangements in place for safe despatch of trains from London Underground stations where station assistants are provided on the platform."