Nuevo Laredo councilman and city policeman slain in ambush MEXICO CITY - Unidentified gunmen shot dead a Nuevo Laredo city councilman and a police commander just blocks from City Hall Friday, continuing a wave of underworld violence gripping the border city this year. Leopoldo Ramos Treviño, 44, who headed the City Council's public security committee, died in a fusillade of bullets at 9:20 a.m. as he drove his pickup toward City Hall in downtown Nuevo Laredo. Witnesses told police that three teenage gunmen boarded a car and drove off following the assassinations. Federico Ocampo, a municipal police commander, also was...