( CNN ) -- Overwhelmed doctors frantically scurried over the weekend to help scores of patients left `` dying on the floor '' amid a punishing air assault on the northern Syrian city of Aleppo . `` There was a big massacre today , '' Dr. Ammar Zakaria told CNN via Skype on Sunday from the country 's largest city and rebel stronghold . `` We were treating shrapnel wounds , deep abdominal and brain injuries . I just lost count of the amputations . '' The Syrian government continued to relentlessly fire on rebel-held sections of the city after days of continued air raids . The city has been targeted for more than a week by helicopters carrying so-called barrel bombs -- drums packed with explosives and shrapnel . The bombs can level entire buildings with one hit . `` A lot of victims died before arriving to the hospital . Many were inside the hospital , and we did n't have the resources to help all the cases , '' added Zakaria , detailing the bloody aftermath . `` We did n't have enough beds to help them all . People were dying on the floor . '' With medical supplies spread thin , each anxiety-filled second was spent suturing the fine line between life and death . Images taken by Zakaria show a mangled ambulance stopped in its path and doctors operating in pools of blood , watching children cling to their last breath through a breathing tube . `` In Aleppo , there is a huge influx of wounded in local hospitals ... less and less security and more bombing on civilian areas , '' Simon Schorno , Syria spokesman for the International Committee of the Red Cross , told CNN by phone from Damascus . The Syrian government said the operations are targeting `` terrorist groups '' in neighborhoods of Aleppo , saying `` scores of terrorists were killed and others were wounded , '' according to the state-run Syrian Arab News Agency . Hundreds have been killed since the bombing began . At least half a million people have been wounded across the country , and millions remain displaced and tens of thousands detained , according to the ICRC . On Sunday alone , 166 people were killed across the country , 92 in Aleppo , according to the opposition Local Coordination Committees in Syria . CNN can not independently verify daily death tolls , but the United Nations says more than 100,000 people have been killed in Syria since 2011 . `` Supplies of food and other basic necessities are running dangerously short , especially in besieged areas , '' said Magne Barth , head of the ICRC delegation in Syria . Schorno described difficult conditions for delivering aid . `` We do n't get the necessary authorizations to get in . The government needs to green-light our movements through the checkpoints and we have to go in on foot , and we can not do that under current conditions , '' Schorno added . The death toll continues to mount as misery for the millions of displaced is exacerbated by the record cold temperatures across the Middle East . The hospital has become home for many Syrian doctors like Zakaria . `` We live in the hospitals because we can not expect the timing of the shelling ; we have to be ready all the time . ''
Doctors have been killed in Aleppo in recent days , opposition propaganda says . Doctors died while standing in pools of blood on the white floors . A barrel ##ling assault on the rebel - held city began more than a week ago .