Traces of the Novichok nerve agent allegedly used to poison Russian opposition leader Alexei Navalny have been found on a water bottle in a Russian hotel room occupied by the politician before he boarded the flight on which he was taken ill.
The BBC reports that a German team of experts identified the nerve agent, after stating that they had "unequivocal proof" that Novichok was used to poison Navalny, who is still being treated in a German hospital.
Russia has categorically denied all allegations.