The Colombian city of Medellin has seen a resurgence of deadly violence that has brought back memories of its notorious drug kingpin, Pablo Escobar. br br Since the beginning of last year, more than a thousand people have been killed in confrontations between street gangs working for rival drug cartels.br br Sadly, most of the victims fit the same profile - young men between the ages of 18 and 26.br br From Medellin, Al Jazeera's Teresa Bo has this report.