(CNN) – The number of civilians fleeing their makeshift homes in northern Syria is likely to be in the tens of thousands, UN officials have told CNN, as the Syrian government steps up its offensive on key rebel-held areas. The Syrian regime, led by President Bashar al-Assad, has resumed airstrikes on rebel-held areas, such as Idlib province, where medical organizations say several hospitals and medical facilities have been hit over the past two weeks.

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