An area of London's Olympic Park has been evacuated following a gas leak at the aquatics centre.
The London Ambulance Service said they are responding to a major incident.
A statement released by the ambulance service said: "We are responding to an incident at Queen Elizabeth Olympic Park.
"We have dispatched multiple resources to the scene and are treating a number of patients.
"Please only call 999 for genuine medical emergencies and use 111 online for any other urgent medical needs."
The London Fire Brigade has now confirmed the leak was caused by a chemical reaction that led to chlorine gas being released, and around 200 people were evacuated as a result.
Fire brigade surround the building
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Emergency Services attended the scene
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The fire brigade said: “Due to a chemical reaction a high quantity of chlorine gas was released. London Ambulance Service are treating a number of patients.
"Around 200 people were evacuated from the centre. While we ventilate the premises we would ask those residents in the immediate vicinity to close doors and windows.”
"The brigade was called at 0945. Fire crews from Stratford and surrounding fire stations are at the scene."
Meanwhile, The London Legacy Development Corporation (LLDC), which manages the park, added: "There was an incident at the London Aquatics Centre ... involving the release of a gas.
"We are working closely with emergency services who are on site. We understand there are a number of casualties with breathing difficulties who are being treated by the London Ambulance Service."
London Mayor Sadiq Khan has also spoken out on the incident, saying: “I remain in close contact with our emergency services who are dealing with a gas-related incident at the London Aquatics Centre this morning.
“A number of people are being treated by London Ambulance Service. Please avoid the area which has been cordoned off and evacuated.”
More to follow...
