MOSCOW, August 21. /TASS/. No poison has been detected in the body of Russian blogger Alexei Navalny, the preliminary version has not changed, a law enforcement source told TASS.

"The preliminary version has not changed. The issue at hand is toxicity from psychodysleptic drugs. It will be possible to provide more specific information after the diagnosis is established and doctors’ conclusion is available," he said.

According to the source, a criminal case has not been opened yet, since there is no data indicating that Navalny was deliberately poisoned. He will be interviewed as part of the investigation as soon as his health permits.

Ivan Zhdanov, a lawyer from Navalny’s Anti-Corruption Foundation, said earlier on Friday that experts had found a dangerous substance in the blogger’s body, which could also pose a danger to people around him.

On August 20, Navalny’s spokeswoman Kira Yarmysh said that the plane carrying the Russian blogger made an emergency landing in Omsk after he suddenly felt ill in mid-flight. Navalny is in a coma. Earlier reports said that he had been connected to a ventilator.