A MAJOR chemical incident has been declared at London's Olympic Park with multiple casualties and 200 people evacuated.

       Police, firefighters and 22 ambulances have swarmed the venue in Stratford, East London after a chlorine gas leak this morning.

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       Multiple resources are on the scene at the aquatics centre Credit: Twitter 7

       A major incident has been declared

       The London Ambulance Service confirmed casualties are being treated at the aquatic centre where the drama unfolded.

       Mayor of London Sadiq Khan has urged people to avoid the area with 200 people including local schoolchildren evacuated.

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       London Fire Brigade said they were dealing with reports of a "chemical incident" and asked nearby residents to close their doors and windows.

       They added: “Due to a chemical reaction a high quantity of chlorine gas was released. London Ambulance Service are treating a number of patients."

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       The LAS tweeted: "London Ambulance Service is responding to a major incident @AquaticsCentre in Stratford alongside colleagues from @LondonFire and @metpoliceuk

       "We have dispatched multiple resources to the scene and are treating a number of patients."

       Horrified witnesses said they were evacuated from the pool while still in their swimwear.

       One told MyLondon: "I was in the pool. Everyone was running out coughing trying to cover their mouths."

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       Police confirmed they were scrambled to the centre following reports of a "leak of noxious fumes".

       The Park said in a statement: "There has been an incident @AquaticsCentre

       this morning involving the release of a gas.

       "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 @Ldn_Ambulance".

       The Aquatics Centre opened in 2012 for the London Olympics but is now open to the general public.

       It has two 50 metre pools and a 25 metre diving pool.

       Chlorine gas was used by the Germans as a weapon in World War One and can be fatal if breathed in.

       Those exposed can experience shortness of breath, blurred vision, burning pain in the nose, eyes and throat and and blisters on the skin.

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       People are being treated for breathing difficulties Credit: pixel8000 7

       Firefighters on the scene today Credit: PA 7

       There has been a suspected chlorine leak Credit: BPM 7

       Around 200 people were evacuated Credit: BPM 7

       Ambulances and fire crews have been scrambled Credit: PA