Bogota's latest battle - this time against the 'Bacrims'

Colombia's battle against armed rebels continues, but now there's a new force to fight. 'Bacrims' - or bandas criminales - started to emerge after another paramilitary group demobilised in 2006. These gangs are responsible for much drug-related violence and extortion, and the government has deployed 11,000 soldiers to try to bring the situation under control.