http://www.dailystar.co.uk/news/lat...ct-Line-Burns-Terror-Train-London-Underground
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The blast appears to have originated from a white bucket in a Lidl bag – which appears to have wires protruding from it – found at the rear of the carriage.
It is reported the device was only a "partial detonation" and police confirmed it was an "improvised explosive device".
Eyewitnesses saw several people "covered in blood" after a "flash and a bang" on the District Line service.
At least 22 people have been taken to hospital, with reports of "facial burns" – but London Ambulance Service confirmed "none have life threatening injuries".
Emergency services including armed police rushed to the scene at Parsons Green station after being alerted at around 8.20am on Friday.
Bomb squad officers, armed police, paramedics and firefighters are all in attendance at the incident – the cause and motive of which remain unknown.
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There were also unconfirmed reports of second device and a knifeman on the run amid the chaos.
People were hurt in a stampede to exit the station following the blast, which comes after Britain has suffered under a wave of terrorist attacks.
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BBC correspondent Riz Lateef, who was at the station travelling to work, said there was "panic as people rushed from the train, hearing what appeared to be an explosion.
"People were left with cuts and grazes from trying to flee the scene. There was lots of panic."
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Natasha Wills, of London Ambulance Service said: "We were called at 8.20am to reports of an incident at Parsons Green underground station.
"We have sent multiple resources to the scene including single responders in cars, ambulance crews, incident response officers and our hazardous area response team, with the first of our medics arriving in under five minutes.
"Our initial priority is to assess the level and nature of injuries. More information will follow when we have it.”