The Home Secretary has responded to the incident in Parsons Green this morning.
Emergency services were called at approximately 8.20am to Parsons Green Underground Station following reports of a fire on the train. The Metropolitan Police Service have declared it a terrorist incident.
Home Secretary, Amber Rudd said:
Once more people going about their everyday lives have been targeted in a callous and indiscriminate way. My thoughts are with all those injured and affected.
The police and emergency services were quickly on the scene and I would like to pay tribute again to their professionalism and tireless commitment.
I am receiving regular updates on what is an ongoing and active investigation.
I would urge Londoners to remain alert and assist the police and emergency services as much as they can.
Appeal for information and images or video
Anyone who has information that would assist detectives is urged to contact the Metropolitan Police Service hotline 0800 789 321; if it's an emergency always call 999.
If you have any images from the scene then please upload them here.
For updates, please follow the Metropolitan Police Service, British Transport Police and other emergency services involved in the incident on Twitter.