In this photo released by the Syrian official news agency SANA, smoke rises in green government buses, in Idlib province, Syria, Sunday, December 18, 2016. Activists said, militants have burned at least five buses assigned to evacuate wounded and sick people from two villages in northern Syria. The incident could scuttle a wider deal that encompasses the evacuation of thousands of trapped rebel fighters and civilians from the last opposition foothold in east Aleppo. (Photo by SANA via AP Photo)
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