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An explosion on a Tube train in south-west London is being treated as terrorism, Scotland Yard has said.
Passengers were injured in the blast at 08:20 BST at Parsons Green station on the District Line.
Pictures show a white bucket on fire inside a supermarket bag, but do not appear to show extensive damage to the inside of the carriage.
Eighteen people had been taken hospital, the London Ambulance Service said in a statement.
The Metropolitan Police said it was too early to confirm the cause of the fire and the station, which is above ground, has been cordoned off.
Passengers were injured in the blast at 08:20 BST at Parsons Green station on the District Line.
Pictures show a white bucket on fire inside a supermarket bag, but do not appear to show extensive damage to the inside of the carriage.
Eighteen people had been taken hospital, the London Ambulance Service said in a statement.
The Metropolitan Police said it was too early to confirm the cause of the fire and the station, which is above ground, has been cordoned off.