BOGOTÁ, Colombia (AP) — Authorities in southwest Colombia were on high alert Saturday following a spate of explosive attacks and thwarted attempts to target public infrastructure. No one was injured in the assaults, which included a shooting at a police station in the rural area of Jamundi, and an attack on a Civil Aviation radar facility in El Tambo, where authorities took down three explosives-laden drones. On Friday, two vehicles rigged with explosives were detonated near military units in