MEXICO CITY - Mexican authorities seized an arsenal of guns and small explosives in a house in the violence-plagued border city of Nuevo Laredo across the Rio Grande from Laredo, Texas, officials said Friday. Authorities, who had obtained a search warrant, also found a small bag of marijuana, fake Mexican army and federal police uniforms, radio equipment, tear gas, night-vision goggles, military-style boots and helmets, handcuffs, and a baseball cap with the DEA emblazoned across the front, Mexico's Attorney General's office said in a news release.The Gulf and Sinaloa drug cartels have been waging war in Nuevo Laredo over control of billion-dollar smuggling routes into the United States, authorities say. So far this year, 166 people have been killed in the city of 300,000.