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Internally displaced woman sits outside a tent in Idlib province, Syria. Image Credit: Reuters

Washington: US President Donald Trump warned Syria against launching an attack on the country's last rebel stronghold with the help of Russia and Iran, saying the offensive could trigger a "human tragedy."

"President Bashar Al Assad of Syria must not recklessly attack Idlib Province. The Russians and Iranians would be making a grave humanitarian mistake to take part in this potential human tragedy," Trump tweeted.

"Hundreds of thousands of people could be killed. Don't let that happen!"