A suspected CS gas attack has occurred on a London Underground train.
The attack happened at 09:13 BST on board a Tube train at Oxford Circus in central London.
British Transport Police said a number of people were treated at the scene by paramedics for coughing and lack of breath – but there were “no further concerns for their health”.
The force has appealed for witnesses and released CCTV images of two people they want to speak to.
A Transport for London spokeswoman said the train had been taken out of service and to a depot for quarantine.
Oxford Circus, situated on the junction of Oxford Street and Regent Street, serves the Central, Victoria and Bakerloo lines.