DEVELOPING: London Police treating subway incident as terrorism

At least 18 people have been taken to hospital after an incident at a subway station in London, England.

The fire at the Parsons Green subway station is being treated as a terrorist incident by London's Metropolitan Police.

Passengers reported an explosion in a carriage of a train during the morning rush hour.

The ambulance service says none of the injuries are thought to be serious or life-threatening at this time.

The mayor of London, Sadiq Khan, says the city "will never be intimidated or defeated by terrorism."