GUNMEN have kidnapped the sole police officer in a northern Mexican town, a 28-year-old woman working alone after her colleagues resigned or were killed in the region's brutal drug war. A dozen unidentified gunmen set Erika Gandara's home ablaze last week and torched two cars parked outside before abducting her, the Chihuahua state prosecutor's office. Guadalupe, the town of 9000 inhabitants she helped keep safe, is located just off the US-Mexico border in the heart of one of the country's most violent regions where 3100 people were killed this year alone. In late November, unidentified gunmen killed another female crime...