Mexican authorities have reportedly pulled 30 corpses from a mass grave in the northern city of Durango and are still digging in the area. According to a government official, 26 dead bodies were found on Wednesday and four more on Thursday. That brings to over 50 the total number of corpses pulled from a handful of trenches in the area during the past two weeks. A bloody war is being fought against drug dealers in Mexico for the last four years. The bodies of most of the 37,000 persons killed in fighting have been found dumped in trenches.