What chemical substance? Is it only in Georgia that rallies are being dispersed?! We see this happening in different countries around the world. Nothing that is prohibited was used. What is allowed and acceptable was used, - said Tbilisi Mayor, Secretary General of the Georgian Dream, Kakha Kaladze, responding to the investigation conducted by the BBC.

According to Kakha Kaladze, a false campaign is underway.

"This is a lie, a false campaign. Many of us remember such facts, speculations. An investigation has been launched in this direction. No substance was used that is prohibited. I say this with full responsibility. Let's wait for the investigation.

Of course, when a deliberate lie is spread, based on lies, on fabrications, without any evidence, it is an attempt against the country. I don't know, I can't speak in codes, I'm not a specialist in the field. We declare with full responsibility, I can tell you one thing, no substance was used that is prohibited. Don't ask me about codes, I'm not a specialist in the field. We are not the BBC to speak without any basis and arguments, that's why an investigation is important," Kaladze noted.

According to the BBC, Georgia's authorities used a World War One-era chemical weapon to quell anti-government protesters last year, evidence gathered by the BBC suggests. Demonstrators against the Georgian government's suspension of its European Union accession bid have complained of other symptoms too - shortness of breath, coughing, and vomiting that lasted for weeks.”

The BBC World Service has spoken to chemical weapons experts, whistleblowers from Georgia's riot police, and doctors, and found the evidence points to the use of an agent that the French military named "camite".