Al-Jazeera has gained exclusive access to a make-shift morgue in the Syrian city of Aleppo, where the bodies of dozens of young men are being held. They were found with their hands tied and a single bullet wound to the head - activists are calling this incident a massacre. It's not clear who carried out the attack - but rebels and the government are blaming each other. Al Jazeera's Zeina Khodr reports from Aleppo.
