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Met police have confirmed terror cops are investigating after the incident on a District Line Tube train at Parsons Green.

"Work colleague was on district line train at Parsons Green when bag exploded," a Twitter user posted.

A white container can be seen on fire inside a Lidl bag.

Other bags can also be seen dumped on the train as people evacuated.

**BREAKING: Explosion on Tube train as passengers 'run for their lives'**

(Image: Twitter)

(Image: Twitter)

Another Twitter user said: "Fireball flew down carriage and we just jumped out open door."

Up to 20 people were injured in the early morning attack.

One witness said: "I'm safe - just had to run for my life at #ParsonsGreen station - huge stamped, lots injured. Not sure why - fire/explosion mentioned."

An onlooker said a "fireball flew down a carriage" with panicked commuters diving out an open door at the South West London station.

**Parsons Green explosion witness describes 'wall of flames' and 'burned' people**

People on social media were quick to speculate that the bag contained a bomb.

"OK Parsons Green appears to be a bomb. Looks like it had less of an impact than it was actually designed to do," one wrote.

Another said: "A bomb has gone off at Parsons Green. I hope everyone is OK."

Bomb disposal experts attended the scene.

**BREAKING: Cops warn of knifeman and SECOND bomb after Parsons Green explosion**

(Image: Twitter) (Image: DS)

Train services through the area have been halted with commuters reporting they were informed of a "security incident".

The Met Police said: "We are aware of an incident at #ParsonsGreen tube station. Officers are in attendance. More info ASAP".

A London Fire Brigade spokeswoman said: "We were called at 8.21am and we have information there was a fire on a train eastbound at the platform at Parsons Green.

**BREAKING: Commuter CHAOS in London after terror attack at Tube station**

(Image: Reuters)

"We have got two fire engines there."

London Ambulance Service has also confirmed it is on the scene.

The District Line Twitter feed reported: "We are investigating an incident at Parsons Green. Customers travelling btn Wimbledon & Earl's Court are advised to use alternative routes."