A delicately timed evacuation deal involving trapped civilians and fighters in war-ravaged east Aleppo and two Syrian villages was thrown into doubt Sunday when assailants torched six buses assigned to the operation. The bus burnings could scuttle a wider deal to evacuate thousands of vulnerable civilians and fighters from the opposition’s last foothold in Aleppo and return the city entirely to government control. Evacuations from Aleppo had been halted amid mutual recriminations Friday, after several thousand trapped civilians had already been moved from the city.
