Several people were injured today after an incident on the London Underground.
Emergency services were called to London’s Liverpool Street Station after reports of an explosion shortly before 9am.
British Transport Police said the incident, reported at at 8.49am on the Metropolitan Line between Liverpool Street and Aldgate, was thought to have been caused by a collision between two trains, a power cut or a power cable exploding.
A London Ambulance Service spokeswoman said: “We have just sent some resources out to the scene. We have sent a number of vehicles to Liverpool Street station.”
BTP confirmed that there are “walking wounded” and said paramedics have responded to one report of a person classed as “life at risk”.
“There are walking wounded, but that is as much as we know at the moment,” said the spokesman.
He confirmed that the incident took place on the Metropolitan Line between Aldgate and Liverpool Street and said the line has been evacuated.
King’s Cross, Liverpool Street and Aldgate stations have also been cleared.
British Transport Police said work is being carried out to establish the precise cause of the problem.
“It’s chaos, with people trying to work out what has happened,” said a spokesman.
“All we know at the moment is that staff reported a loud bang at 8.49am.
“No one is sure what caused an explosion, but it is thought it could have been a collision, a power cut, or a power cable problem.”
According to Tube infrastructure company Metronet, which is responsible for maintaining the Metropolitan line, today's incident was caused ``by some kind of power surge''.
A spokesman went on: “We don’t know the extent of the problem yet.”
The incident caused major disruption to the entire network with stations across the capital being closed.
Passengers were told that all services were being suspended because of a power fault across the network.
A City of London Police spokesman said: “We have closed Liverpool Street station as well as Aldgate.
“We believe there was some sort of explosion. There are some walking wounded at Aldgate.
“We are not sure of the scale of the incident. Reports are still coming in.”
London Underground said that there has been “another incident at Edgware Road” station in north west London.