Twenty trucks loaded with desperately needed aid for eastern Aleppo have crossed into a buffer zone between Turkey and Syria, a high-level UN official said Thursday. 

"The 20 trucks ... have passed over the Turkish border, they are in the buffer zone between the Turkish and Syrian border," Jan Egeland, head of the United Nations humanitarian taskforce for Syria, told reporters, voicing hope the aid could be delivered to eastern Aleppo on Friday.