Rush-hour commuters trying to board Northern Line trains from Waterloo faced severe delays on Thursday evening after a person was hit by a train.
The person was hit by a northbound train at around 6.30pm, British Transport Police said.
Emergency services were called to the scene in Waterloo underground station at 6.37pm and worked to “extract the person” from under the train.
There was no northbound Northern line service between Kennington and Charing Cross for over an hour and severe delays between the station and Camden Town, according to Transport for London.
One commuter posted a picture of long lines of people queuing for the Bakerloo line as northern line travellers rushed to use a different service.
Amanda K wrote: “No Northern Line from Waterloo so the Bakerloo is rammed!!”
Becky Brynolf posted: “Northern Line friends, there’s been an accident at Waterloo and the Charing Cross branch has been suspended for a while.”
Police said they were treating the incident as non-suspicious. The condition of the victim remains unknown.
A spokesman for BTP said: "We were called to Waterloo station at 6.37pm to a person under a train on the Northern line.
"Emergency services are on the scene and are working to extract the person.
"It is a non suspicious incident."
TfL said the line had reopened shortly before 8pm but that commuters should continue to expect delays and queues to board trains.