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Media caption The BBC's Will Grant says the murders are probably the result of an ongoing drug war in the Mexican state of Michoacan 
  
 Mexican police found 15 bodies piled up at a petrol station in the western state of Michoacan, authorities say. 
  
 Three youths were among the dead and all the bodies showed signs of torture. 
  
 Threatening messages had been left next to the bodies, indicating that the killing might have been a settling of scores between gangs, officials said. 
  
 Michoacan is at the centre of a violent battle between the La Familia cartel and a rival offshoot of the gang, which calls itself the Knights Templar. 
  
 The bodies, all of them male, were found in the early hours of the morning at a petrol station in the town of Zitacuaro. 
  
 Initially, authorities had reported 13 victims but the Mexican Interior Ministry later said 15 people had been killed. 
  
 Police said the victims had bullet wounds to their heads. 
  
 Michoacan has seen a rise in violence blamed on the break-up of the area's powerful cartel, La Familia Michoacana. 
  
 Officials say the killing by the security forces in December 2010 of the gang's leader, Nazario Moreno, has severely weakened La Familia. 
  
 But analysts say the Knights Templar, which split off from La Familia, has taken over many of the cartel's operations and now runs much of the methamphetamine production and trafficking in the west of Mexico. |||||  
  
 REPORTING FROM MEXICO CITY -- Authorities on Monday discovered 13 bodies dumped at a gas station near the city of Zitacuaro, about 90 miles west of Mexico City in Michoacan state. 
  
 The dead included two minors, state prosecutors said. All were male and most had been shot in the head and bore signs of torture (link in Spanish). Hand-scrawled threatening messages that were left with the bodies alluded to the fight between rival drug cartels. 
  
 Michoacan has been the scene of intense warfare between the state's once-dominant La Familia gang and a rival offshoot calling itself the Knights Templar. The state is also the first place President Felipe Calderon deployed troops when he launched his offensive against traffickers at the start of his administration five years ago. Michoacan is Calderon's home state and recently saw regional elections badly marred by traffickers' threats. 
  
 "We are once again news today, nationally and internationally, because of this macabre event," Zitacuaro Mayor Juan Carlos Campos Ponce told reporters (link in Spanish). 
  
 In more peaceful times, Zitacuaro was a jumping-off point for tourists observing the famous monarch butterflies who migrate to the region this time of year. 
  
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 Dirty Money: A series on drug gangs and money laundering 
  
 Boxer shorts lead to cancellation of results in key Mexican vote 
  
 Blasts targeting civilians kill seven 
  
 -- Tracy Wilkinson 
  
 Photo: Blankets cover some of the 13 corpses discovered Monday near a gas station in Zitacuaro in Mexico's Michoacan state. Credit: Agencia Quadratin / Agence France-Presse / Getty Images |||||
Output:
The drug war appears to be heating up again in Mexican President Felipe Calderon's home state. Some 15 semi-naked bodies were found in a pile outside a gas station in Zitacuaro, Michoacan state, the BBC reports. All of the victims were male and three were minors. Police say threatening messages were left next to the bodies, which showed signs of torture. The state had been relatively peaceful after police killed the boss of La Familia cartel in December 2010, but the remnants of that cartel are now at war with an offshoot calling itself the Knights Templar, reports the Los Angeles Times. The Times notes that in less troubled times, Zitacuaro was primarily known for tourists who would gather to watch the annual migration of monarch butterflies.