MOSCOW, August 20. /TASS/. The theory that Russian blogger Alexei Navalny may have been deliberately poisoned is not being considered now, a source in the Russian law enforcement agencies told TASS on Thursday.

"This theory is not being considered now. It is not ruled out that he drank or took something yesterday himself," the source said.

When Navalny was admitted to hospital, he was diagnosed with "acute poisoning with psychedelics," he noted.

On Thursday morning, Navalny’s spokeswoman Kira Yarmysh said that the plane carrying the Russian blogger from Tomsk to Moscow had made an emergency landing in Omsk because he felt unwell. She added that Navalny was unconscious.

Chief doctor at the Omsk hospital, where Navalny was sent, confirmed to TASS that he was in serious condition and put on a ventilator.