More than a million Syrian children are at risk in the event of a government military assault on the rebel-held province of Idlib, the United Nations Children's Fund (UNICEF) said Friday.

Manuel Fontaine, UNICEF's director of emergency programs, said that the agency has drawn up contingency plans including providing clean water and nutritional supplies to some of the estimated 450,000 to 700,000 people who could flee an attack.

An estimated 2.9 million people live in the northern region of Idlib, half of them already displaced from other areas in Syria as opposition supporters fled there from other areas captured by government forces.