Al-Jazeera Video: Fierce battles as rebels fight to hold Aleppo

"Fierce fighting has erupted in rebel-held districts of Aleppo for the second straight day as opposition forces continue to hold out in Syria's largest city. At least 200,000 residents of the country's commercial capital have fled in the past two days, according to the United Nations. Several neighbourhoods in Aleppo where rebels are active have come under heavy government shelling, leading to casualties among both fighters and civilians. Al Jazeera's Jamal El Shayyal reports."