NUEVO LAREDO - Despite the presence of federal troops and state police throughout the streets, violence continues to plague the Sister City, with six homicides reported over the weekend, including that of a state police officer. The death toll for the year, which still has more than five months to go, stands at 90. The most recent victims were Víctor Manuel Castillo Andrade, 18, who died near midnight Saturday; Noe Vives, a state police officer shot dead Sunday night; and Arturo Puente Alonso, 28, killed early Monday. Authorities had already logged three other deaths, one on Friday and two on...