One of the busiest tube stations on London has been evacuated after an electrical fault caused smoke to fill a train carriage at platform level.
London Fire Brigade said it had dealt with a "small fire" on a Bakerloo line train and that they are investigating the cause.
Firefighters were called to the scene at 8.50am local time and three fire engines were sent from Paddington and Lambeth stations.
The British Transport Police say they do not currently believe the cause of the fire to be suspicious.
Pictures on social media show grey smoke billowing out of the carriage on the Bakerloo line while passengers stand on the Oxford Circus platform covering their mouths and noses.
Other photographs show people standing in dark, smoke-filled carriages covering their faces with items of clothing.
The London Ambulance Service said: “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.”
Nigel Holness, London Underground’s Director of Network Operations said: “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.”
Oxford Circus station services London's busiest shopping street and sees thousands of commuters pass through it during the rush hour.
Additional reporting by Marese O'Sullivan
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