A plane with Russian blogger Alexey Navalny on board heading from Tomsk to Moscow, conducted an emergency landing due to his alleged poisoning, the opposition figure’s spokeswoman Kira Yarmysh announced Thursday.

"This morning, Navalny was on his way from Tomsk to Moscow. He started to feel bad during the flight. The plane conducted an emergency landing in Omsk. Alexey has toxic poisoning. We are currently in an ambulance on our way to the hospital," Yarmysh tweeted.

The Omsk airport confirmed that the airliner landed because a passenger felt unwell.

"Yes, Sibir flight 2614 from Tomsk to [Moscow’s] Domodedovo has landed, [because] a passenger felt bad. An ambulance has arrived," airport spokeswoman Galina Gavrish said, adding that she did not know the identity of the passenger.