The group had been traveling on a dirt road in the San Dimas municipality in the hills in Durango state when they were ambushed by unidentified people who later fled, media quoted the state attorney general's office as saying.
The municipality is near the border with Sinaloa state, the home of drug lord Joaquin "El Chapo" Guzman, who broke out of a high-security prison earlier this month for the second time.
The 11 dead, who were all men, had bullet wounds to various parts of their bodies, according to the reports.
Representatives for the state attorney general's office and state public security ministry could not be reached for comment, Reuters reported.