This is stated on the CPVS website.
"The Russian Center for the Reconciliation of Warring Parties received information that militants of the terrorist group Jabhat al-Nusra have stored containers with toxic substances in an underground shelter near the city of Sarmada, Idlib province," the message says.
It is clarified that the terrorists intend to organize provocations in order to accuse the Syrian government forces of using chemical weapons against civilians.
In early November, it was reported that White Helmets members intend to organize a provocation in the Idlib de-escalation zone in order to then accuse government forces of inflicting "indiscriminate attacks on civilian objects and civilians."
*
“Jabhat al-Nusra” (“Hayat Tahrir ash-Sham”, “Jabhat Fath al-Sham”, “Front al-Nusra”) - the organization was recognized as terrorist by the decision of the Supreme Court of the Russian Federation dated December 29, 2014.