Queen Elizabeth Olympic Park says there are a ‘number of casualties with breathing difficulties

Emergency services in London are attending a “major incident” at the Aquatics Centre in Stratford amid reports of patients with “breathing difficulties.” "There has been an incident at @AquaticsCentre this morning involving the release of a gas,” the Queen Elizabeth Olympic Park said on Twitter.It said: "The area has been cordoned off and evacuated. We're working with emergency services on site. There are a number of casualties with breathing difficulties being treated” by the London Ambulance Service.The ambulance authorities said they were attending to the incident alongside other emergency services. The London Fire Brigade said they were dealing with reports of "a chemical incident." London Mayor Sadiq Khan has asked people to avoid the area.