Campaigners opposed to an Olympic Stadium sponsorship deal kept up the pressure on Games organisers by unveiling a wrap of their own.

Dow Chemical, which will pay for the official wrap surrounding the Stratford venue, has been accused of neglecting survivors of the Bhopal gas leak disaster in 1984.

The firm bought Union Carbide, the company in charge of the plant, 16 years later.

Bosses deny any responsibility for the leak, which resulted in the deaths of thousands of people.

But Dow’s involvement in the London 2012 Games has prompted outrage from survivors of the disaster.

One of them, Sanjay Verma, said: “For thousands of Bhopal survivors, April 20 marked 10,000 and one nights of pain.”

Fellow campaigner and author Indra Sinha added: “Let’s be clear. Whoever is to blame for the continuing health disaster in Bhopal, the only people who cannot possibly be responsible are the victims, who are also the only people being punished.”

A Locog spokesman said its position had not changed. Dow Chemical is an official International Olympic Committee (IOC) sponsor.

“Dow were appointed following a competitive procurement process,” she added.