A grenade attack killing four people in the town of Pauna, in the western Boyacá department, has sparked concerns about a revival of the so-called ‘green war’ between rival emerald tycoons in the department in the 1980s. Colonel Carlos Antonio Gutiérrez, the departmental police chief for Boyacá, (where the country’s largest emerald mines are located), told reporters on 10 November that the grenade lobbed the previous day into a crowd in the town centre was an assassination attempt on Pedro ‘Orejas’ Nel Rincón. A leading player in the local emerald mining business, Nel Rincón had been attending a local festival…