Navalny, 44, began feeling unwell while on a return flight to Moscow in the Siberian city of Tomsk, '' his spokeswoman Kira Yarmysh, said on Twitter. The plane later made an urgent landing in Omsk, she added.
He only drank black tea at an airport cafe prior to takeoff, Yarmysh told Russian radio station Echo of Moscow.
"We presume that Alexey was poisoned with something blended to the tea. It was the only thing that he drank in the afternoon. Doctors say the toxin was consumed faster throughout the hot liquid," Yarmysh tweeted.
Navalny remains unconscious and is currently connected to a ventilator, Yarmysh said.
Loud groaning could be heard in video footage allegedly filmed on the flight taken by Navalny, which has been shared around the Baza Telegram station. More video seemingly filmed through the airplane window shows an immobile person being accepted by wheeled stretcher to a waiting ambulance.
Navalny has been admitted to the acute poisoning unit of Omsk emergency hospital No. 1 and also is at a "serious illness," hospital head doctor Alexander Murakhovsky said, according to Russian state news agency TASS.
The hospital's deputy head doctor, Anatoly Kalinichenko, talking to local journalists at a makeshift news conference, later affirmed that Navalny was in the hospital in a critical condition. He had been on a ventilator but was steady, the doctor said.
Asked by a journalist when Navalny had been poisoned, Kalinichenko said: "Obviously, poisoning is thought of one of the possible causes of the deterioration of the condition. But other than that, this might be several ailments that started acutely and contributed to the exact same clinical responses. We're working on all them: excluding, confirming."
Kalinichenko said he believed doctors would have a diagnosis later Thursday. In the meantime, Navalny's symptoms are being treated, he explained.
Yarmysh tweeted a video of this news conference, saying the deputy head doctor had confirmed what was already known. "He said exactly the same: stable serious illness, coma, ventilator. Doesn't say anything about the diagnosis or whether there's a danger to life," she explained.
In a previous tweet, Yarmysh said the intensive care unit was full of police officers.
"They attempt to obtain an explanation by the physician. The doctor saw me in the distance in the corridor, stated that 'some things are confidential' and required the authorities to another room," Yarmysh said.
"The evasive response of physicians only affirms that this is poisoning," Yarmysh added. "Just two hours ago, they were ready to share any information, and now they are clearly biding for time and aren't saying what they understand."
More details are emerging of the events leading up to Navalny's hospitalization.
Yarmysh told Russian media outlet Mediazona which Navalny had revealed no signs of sickness until after they'd taken off from Tomsk.
"He explained that he was not feeling well and asked me for a napkin, he'd sweat," Yarmysh told Echo. "He asked me to talk to him since he wished to focus on the sound of this voice. I talked to him, and a trolley with water came up to us I inquired if water could help him; he stated no. He then went into the toilet, and he lost consciousness"
S7 Airlines advised TASS that the opposition leader hadn't eaten or drunk anything throughout the flight.
"Soon after the takeoff of flight S7 2614 Tomsk-Moscow, the state of health of a few of those passengers, Alexey Navalny, sharply deteriorated.... While on board, Alexey did not drink or eat anything," the firm said.
Based on S7, the crew "worked fast and strictly in accordance with the procedures."
After refueling, the airplane went to Moscow but two passengers who were flying with Navalny stayed in Omsk, TASS said.
Investigation call
"There is not any doubt that Navalny was poisoned because of his political position and actions," Gimadi explained.
Navalny formerly suggested he might have been poisoned in July this past year, although he was being held in police custody and suffered a mysterious allergic response.
He explained that despite suffering from allergies he woke up in a detention facility with a dangerous swelling of his face and eyelids. After receiving medical assistance, he was sent back to detention.
Doctors didn't find any symptoms of poisoning after performing analysis on the resistance leader, TASS reported previous year.
He only drank black tea at an airport cafe prior to takeoff, Yarmysh told Russian radio station Echo of Moscow.
"We presume that Alexey was poisoned with something blended to the tea. It was the only thing that he drank in the afternoon. Doctors say the toxin was consumed faster throughout the hot liquid," Yarmysh tweeted.
Navalny remains unconscious and is currently connected to a ventilator, Yarmysh said.
Loud groaning could be heard in video footage allegedly filmed on the flight taken by Navalny, which has been shared around the Baza Telegram station. More video seemingly filmed through the airplane window shows an immobile person being accepted by wheeled stretcher to a waiting ambulance.
Navalny has been admitted to the acute poisoning unit of Omsk emergency hospital No. 1 and also is at a "serious illness," hospital head doctor Alexander Murakhovsky said, according to Russian state news agency TASS.
The hospital's deputy head doctor, Anatoly Kalinichenko, talking to local journalists at a makeshift news conference, later affirmed that Navalny was in the hospital in a critical condition. He had been on a ventilator but was steady, the doctor said.
Asked by a journalist when Navalny had been poisoned, Kalinichenko said: "Obviously, poisoning is thought of one of the possible causes of the deterioration of the condition. But other than that, this might be several ailments that started acutely and contributed to the exact same clinical responses. We're working on all them: excluding, confirming."
Kalinichenko said he believed doctors would have a diagnosis later Thursday. In the meantime, Navalny's symptoms are being treated, he explained.
Yarmysh tweeted a video of this news conference, saying the deputy head doctor had confirmed what was already known. "He said exactly the same: stable serious illness, coma, ventilator. Doesn't say anything about the diagnosis or whether there's a danger to life," she explained.
In a previous tweet, Yarmysh said the intensive care unit was full of police officers.
"They attempt to obtain an explanation by the physician. The doctor saw me in the distance in the corridor, stated that 'some things are confidential' and required the authorities to another room," Yarmysh said.
"The evasive response of physicians only affirms that this is poisoning," Yarmysh added. "Just two hours ago, they were ready to share any information, and now they are clearly biding for time and aren't saying what they understand."
More details are emerging of the events leading up to Navalny's hospitalization.
Yarmysh told Russian media outlet Mediazona which Navalny had revealed no signs of sickness until after they'd taken off from Tomsk.
"He explained that he was not feeling well and asked me for a napkin, he'd sweat," Yarmysh told Echo. "He asked me to talk to him since he wished to focus on the sound of this voice. I talked to him, and a trolley with water came up to us I inquired if water could help him; he stated no. He then went into the toilet, and he lost consciousness"
S7 Airlines advised TASS that the opposition leader hadn't eaten or drunk anything throughout the flight.
"Soon after the takeoff of flight S7 2614 Tomsk-Moscow, the state of health of a few of those passengers, Alexey Navalny, sharply deteriorated.... While on board, Alexey did not drink or eat anything," the firm said.
Based on S7, the crew "worked fast and strictly in accordance with the procedures."
After refueling, the airplane went to Moscow but two passengers who were flying with Navalny stayed in Omsk, TASS said.
Investigation call
"There is not any doubt that Navalny was poisoned because of his political position and actions," Gimadi explained.
Navalny formerly suggested he might have been poisoned in July this past year, although he was being held in police custody and suffered a mysterious allergic response.
He explained that despite suffering from allergies he woke up in a detention facility with a dangerous swelling of his face and eyelids. After receiving medical assistance, he was sent back to detention.
Doctors didn't find any symptoms of poisoning after performing analysis on the resistance leader, TASS reported previous year.