Colombian authorities will begin exhumation next week at the recently discovered largest urban mass grave in the world, located outside Medellin. The site is expected to contain up to 300 bodies, believed to be civilian victims of former president (and current senator) Alvaro Uribe's Operation Orion from 2002 to 2005. Peace talks currently underway are focusing precisely on victim compensation and truth seeking. Natalia Margarita reports from Bogota. teleSUR