Police are investigating an incident on the District Line underground train at Parsons Green in south west London.
Metropolitan Police are aware of the incident, said to have been an explosion which has left a number of commuters injured.
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Ambulance services are on the scene, with reports of facial burns suffered by some.
"We were called at 8:20am to reports of an incident at Parsons Green underground station," a spokesperson for London Ambulance
said.
"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."
The station has been closed while the service between Earls Court and Wimbledon has been suspended.
Pictures released show a white bucket with flames on the inside but there appears to be minimal damage to the carriage itself.
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Less than two hours after officers arrived on the scene, the explosion was declared a terrorist incident.
https://twitter.com/metpoliceuk/status/908620962987433984
More to follow.
