Surgical hit: A leader of a Mexican fuel-theft gang was shot dead last week while undergoing surgery to change his appearance and erase his fingerprints. Jesús Martín was on the operating table at a clinic in the city of Puebla when gunmen burst into the building and killed him and three other people, prosecutors said. The assassins were members of Martín’s own gang. The killings come amid a surge of infighting among fuel gangs in the state of Puebla, where at least 16 people have been killed in the past week. Fuel thieves drill an average of 28 illegal taps into gas pipelines in Mexico every day, and then sell the siphoned fuel. The dangerous but lucrative business has become Mexico’s secondbiggest organized crime problem after drug trafficking.