Mexican authorities announced the arrest of eight gunmen in connection with the recent dismemberment of five bodies inside a taxi cab and three others left in a clandestine gravesite near the tourist hotspot of Cancun. The arrest comes as the region has seen a dramatic spike in violence, including the fatal shooting of a U.S. woman and, in a separate case, the kidnapping of a U.S. man who was held for days until authorities rescued him.