Mexican authorities have discovered 32 bodies and nine heads hidden in mass graves in a southern region plagued by violence from drug cartels. <br/><br/>Investigators exhumed the remains of 31 men and one woman from a hillside in Zitlala where turf wars between rival criminal gangs are common. <br/><br/>The discoveries are terrible, a security spokesperson said, while the search for any additional hidden graves continued in the region. The remains were found in 17 different pits near the village of Pochahuixco between Tuesday and Thursday. No arrests have been made so far.<br/><br/>State security spokesman Roberto Alvarez said the graves had been discovered following an anonymous tip, which led to the discovery of a kidnap victim. The remains have been sent to the state capital to be identified.