The Kremlin said on Tuesday, August 25 it saw no need for now to investigate the circumstances leading up to opposition politician Alexei Navalny’s grave illness and that a German clinic’s initial diagnosis of poisoning was not yet conclusive, Reuters reports.

German Chancellor Angela Merkel on Monday called on Russia to investigate the suspected poisoning and to hold the perpetrators accountable after German doctors found indications of a toxic substance in his body.

But Kremlin spokesman Dmitry Peskov said the German clinic had not conclusively identified the substance behind Navalny’s illness and that it was unclear why German doctors were “rushing” to use the word poisoning.

“There must be a reason for an investigation. For the moment, all you and I see is that the patient is in a coma,” Peskov told reporters on a conference call.

He added that if poisoning was definitively established as the cause, then an investigation would be launched.

“If the substance is identified and it is determined it was a poisoning, then, of course, this will be a reason for an investigation,” Peskov added.

Demands for a probe are intensifying, with Sweden’s Foreign Minister Ann Linde on Tuesday saying on Twitter that the “circumstances regarding the suspected poisoning of @navalny need to be clarified by independent investigation.”