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An "explosion" on board a packed Tube train sparked panic during the morning rush hour.

Commuters fled in terror after hearing an explosion and feeling a "heatwave" move through a carriage on board a District line train.

Witnesses described being “horrified and shaken” after the incident at Parsons Green station at about 8.25am.

One wrote on Twitter: "Never been so scared in my life," while another said there was an "extremely heavy armed police presence".

All trains are suspended between Earl's Court and Wimbledon as emergency services deal with the incident.

A photo allegedly from the scene shows what looks like a bucket which had been set on fire.



Work colleague was on district line train at Parsons Green when bag exploded #london pic.twitter.com/1yXOsFVAJ1 — Andy Webb (@andyjohnw) September 15, 2017

I'm safe - just had to run for my life at #ParsonsGreen station - huge stamped, lots injured. Not sure why - fire/explosion mentioned. pic.twitter.com/zRvRPWOuzA — Emma (@EmmaStevie1) September 15, 2017

British Transport Police said an incident is ongoing and their officers are currently at the scene.

