The U.N. refugee agency says it has been unable to reach all 200,000 people fleeing the fighting in Aleppo, Syria’s largest city.

The agency’s spokeswoman, Melissa Fleming, told reporters Tuesday that thousands of frightened residents are seeking shelter in schools, mosques and makeshift facilities.

The International Organization for Migration says it has moved more than 900 Syrian refugees since Sunday from crowded transit facilities to a new camp set up by Jordan’s government and the U.N. refugee agency.

IOM spokesman Chris Lom said Tuesday the camp for 5,000 in Jordan near the Syrian border may be expanded to accommodate 150,000 , “if the conflict in Syria worsens resulting in a mass exodus of refugees”.

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