The saga continues.....
"... last Friday there was another British tourist held up, in Teodoro Garcia and Villanueva. A passing guy on a motorcycle chased the motochorro, hit him with his helmet, and knocked him off the bike. Bystanders then held him until the police arrived. He was Venezuelan - checking his phone and social web connections they found the rest of the gang."
The police traced many calls to the gang's hideout in Ciudadela. While they were searching it, the murderer's girlfriend showed up to pick up her belongings. When questioned, she showed the Police a photo of her boyfriend, and said they had entered Argentina from Bolivia, through an illegal crossing point in Salta. The police figured they might try to leave the same way. So they canvassed all bus companies for any Venezuelans traveling to Salta, and located the bus the three guys were on. The bus was stopped, and the three guys were detained before escaping to Bolivia.
Amazing efficiency.....!