Al Jazeera has investigated the events surrounding an alleged massacre in northern Mali. In January 2012 fighters from the Ansar Dine, an Al Qaeda-linked group, captured a Malian military base in Aguelhok. 128 soldiers were killed and a number fled. Two days after the battle, troops loyal to the Malian government published pictures in which soldiers appeared to have been handcuffed and shot. The governments of Mali and France said 82 of the soldiers had been executed. They blamed Ansar Dine and Tuareg rebels. In this exclusive report, Mohammed Vall uncovers a different version of the alleged massacre at Aguelhok.