The Berlin hospital treating the seriously ill Russian opposition leader, Alexei Navalny, says he appears to have been poisoned, the BBC reports.
The Charite hospital released a statement saying "clinical evidence suggests an intoxication through a substance belonging to the group of cholinesterase inhibitors".
His condition was "serious but not life-threatening" the statement said.
He 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.