fred, thank you so much. let s discuss this more. joining me now, cnn chief correspondent host of amman pour, christiane amanpour. horrific seems to be the status what s going on now in aleppo. images coming out, hard to imagine it could get worse, but seems it has. reporter: well, kate, indeed, the very, very worst is if there were to be continued mass executions of civilians, non-combatants, men, women and children which already, as you heard fred say, the u.n. is picking up reports, and we also have been talking to people who have been trapped behind the lines. as fred was following the advance of the syrian forces further and further into eastern aleppo, as they took it back from the rebels, after about four years, we were also talking by skype and telephone to people still trapped behind the lines waiting for the forces just to