Heavily armed troops patrol the city, combat erupts in the streets and mutilated bodies are dumped in parking lots, ditches and curbs.  After years of relative calm, the gangland nightmare is back — and yet, barely a single mention of the clashes here has been made by local radio and television stations or newspapers. The city's journalists, having lost some of their own and seen their colleagues across the country killed or kidnapped, have been silenced for fear for their lives.  "Nowhere is the media controlled more than it is here," said one reporter, who stressed he would face serious danger if identified. "There is total control."