Mr Navalny is being treated at the Charite hospital in Berlin Reuters
The Berlin hospital treating the seriously ill Russian opposition leader, Alexei Navalny, says he appears to have been poisoned.
The Charité hospital released a statement saying "clinical evidence suggests an intoxication through a substance belonging to the group of cholinesterase inhibitors".
But doctors who treated him in Russia say the substance was not present.
Mr Navalny fell ill on an internal flight in Russia on Thursday.
Video appeared to show Mr Navalny, a dogged critic of the Kremlin, writhing in agony on the flight from Tomsk in Siberia to Moscow.
His supporters suspect poison was placed in a cup of tea he drank at the airport in Tomsk.
Mr Navalny's flight made an emergency landing in Omsk where he was first treated.
In their latest statement released after that of the German medical team, the Omsk doctors say tests showed no sign of cholinesterase inhibitors in his body. Speaking last week, the same team suggested his illness was caused by a metabolic disorder triggered by low blood sugar.
On Friday, they at first said he was too ill to be moved but then allowed him to board a medical evacuation flight, which landed in Berlin on Saturday morning.
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