Oxford Circus Tube station was evacuated this morning as firefighters investigated after smoke was seen on the Bakerloo line.
London Fire Brigade was called just before 9am on Friday (August 11).
Posting to Twitter at 8.52am on Friday, the Bakerloo Line wrote: "Oxford Circus station - Closed while we respond to a fire alert."
Twitter users have been sharing images on Twitter showing smoke coming from Tube trains.
Severe delays continued throughout the day.
We will be bringing you all the very latest updates, pictures and video on this breaking news story as it develops.
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Live blog closes
As we bring our live blog to a close, the Bakerloo Line is reporting a “good service”.
Follow the link below for everything we know so far about the incident this morning:
As we approach rush hour, the Bakerloo Line reports a 'good service'
Bakerloo Line is now reporting minor delays
Delays into afternoon
This is the latest from Transport for London:
Severe delays between Queens Park and Harrow & Wealdstone only, due to an earlier fire alert at Oxford Circus. MINOR DELAYS on the rest of the line. London Underground tickets will be accepted on Southeastern Trains, Thameslink and local bus services.
Severe delays remain on Bakerloo Line
According to Transport for London, severe delays remain on the Bakerlook Line.
Passengers are advised London Underground tickets are being accepted on Southeastern Trains, Thameslink and local bus services.
'Cause of the smoke was an electrical fault' say London Underground
London Underground’s director of network operations, Nigel Holness said:
At around 8:50am our staff were alerted to reports of smoke on a Bakerloo train approaching Oxford Circus.
Our staff immediately contacted the emergency services, who quickly attended, and ensured customers left the train and exited the station.
The cause of the smoke was an electrical fault under one of the carriages, which resulted in a small fire that was quickly extinguished.
Understandably this was a distressing incident for our customers, for which I give my sincere apologies.
A comprehensive investigation into how this incident could have occurred is now underway.
Our Sarah Hope Line, which is set up to help those affected by incidents on the transport network, is also available to offer support.
Everything we know so far
Head to our latest story on the incident for all of the information we know so far:
'It was really intense and scary'
An anonymous eyewitness spoke to getwestlondon about her experience during the evacuation, she said: “At the time they said security alert and it was really intense and scary.
She added: “Everyone got really pushy and shovey and it was intense.”
She explained staff wanted “everyone out as quick as possible” and described the experience as “scary.”
Video shows emergency services at the scene
Oxford Circus Tube station has reopened
Bakerloo Line service resumes with severe delays
London Ambulance Service treated four patients
A spokesman for London Ambulance Service said:
We were called at 8.53am today to reports of an incident on board a Bakerloo line train at Oxford Circus tube station.
We sent an ambulance crew, our Hazardous Area Response Team and an incident response officer to the scene, with the first of our medics arriving in less than five minutes.
We treated four patients at the scene for smoke inhalation and have taken two of them to hospital as a precaution.
'Firefighters dealt with a small fire on a train'
A spokesman from London Fire Brigade said:
Firefighters dealt with a small fire on a train on the Bakerloo line at Oxford Circus.
The station was evacuated before the Brigade arrived.
The Brigade was called at 0847.
Fire crews from Paddington and Lambeth fire station were at the scene.
The cause of the fire is under investigation.
The station remains closed
Sign above Tube station entrance reads: "Emergency. Do not enter"
Image shared on Twitter shows smoke inside a train
Twitter users describe scenes of panic inside the station
Smoke is at platform level
London Fire Brigade has said they are investigating smoke at platform level.
Posting to Twitter at 9.31am, the Brigade said:
We are continuing to investigate smoke issuing at platform level at #OxfordCircus tube station.
Video shows smoke inside a Tube train
Incident not currently being treated as suspicious
Posting to Twitter at 9.25am, British Transport Police said:
We continue to work with @LondonFire at Oxford Circus.
Station remains closed.
Cause of fire not currently being treated as suspicious @TfL
Minor delays on the Bakerloo Line
On their website, Transport for London say:
Bakerloo Line: No service Elephant & Castle to Piccadilly Circus while we respond to a fire alert at Oxford Circus.
MINOR DELAYS on the rest of the line.
London Underground tickets will be accepted on SouthEastern Trains, Thameslink and local bus services.
British Transport Police are at the scene
London Fire Brigade called to reports of smoke
London Fire Brigade were called to the scene at just before 9am