The mayor of London says the city "will never be intimidated or defeated by terrorism."
Sadiq Khan says the city "utterly condemns the hideous individuals who attempt to use terror to harm us and destroy our way of life."
He says Londoners should remain "calm and vigilant" after a fire on a subway train that police are calling a terrorism incident.
London has been targeted by attackers several times this year, with vehicle attacks near Parliament, on London Bridge and near a mosque in Finsbury Park in north London.
Khan says he will be attending a meeting of the government's COBRA emergency committee with Prime Minister Theresa May later.
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