"An emergency meeting of the ISSG (International Syria Support Group) Ceasefire Taskforce will take place later today," the office of special envoy Staffan de Mistura said.
"The meeting, which will be chaired by the Special Envoy, was requested by the Russian Federation co-chair and agreed upon by the United States co-chair."
A spokeswoman for de Mistura said the meeting would start at 1500 GMT, and no statement, either written or oral, would be made afterwards.
The US fired a barrage of 59 cruise missiles at Shayrat airbase in northern Syria overnight, responding to a suspected chemical attack on a rebel-held town on Tuesday widely blamed on the Damascus regime.
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