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It said the sides confirmed their “agreement in principle” to lists of participants proposed by the Syrian government and the opposition and held consultations on which civil society groups would also participate in the committee.

The ministry said the Turkish, Russian and Iranian officials would hold more talks on the issue at a “technical level.”

On Monday, the head of the U.N. humanitarian agency, Mark Lowcock, warned that Idlib could see “the worst humanitarian catastrophe, with the biggest loss of life of the 21st century.”

Iran and Russia have backed a military campaign on Idlib involving Syrian President Bashar Assad’s forces, despite Turkey’s pleas for a cease-fire.

Before Tuesday’s meeting, Hossein Jaberi Ansari, a special envoy for Iran’s foreign minister, said a “good result” could emerge. Asked whether Iran shared the concerns about a possible humanitarian catastrophe in Idlib, Jaberi Ansari replied: “We are worried too. We are trying to avoid this.”

Russian President Vladimir Putin’s special envoy for Syria, Alexander Lavrentiev, declined to answer a question on his way into the talks about whether Russia would stop its airstrikes.

De Mistura met informally with members of the three delegations on Monday.

The talks are set to focus on creating a constitutional committee under Syria’s Russian- and Iranian-backed government. Russia, Turkey and Iran have been working together as “guarantors” for a series of talks around ending Syria’s war. Turkey has taken in 3.5 million refugees from its neighbour.

On Monday, airstrikes on Idlib and Hama provinces forced some people to flee their homes, according to the Britain-based Syrian Observatory for Human Rights.