By Michael Williams, Rafael Romo, CNN (CNN) — One of the top leaders of Tren de Aragua, a cartel and US-designated terrorist organization, has been killed in a US military strike, President Donald Trump said Friday. Héctor Rusthenford Guerrero Flores, known as Niño Guerrero, was credited with transforming a Venezuelan prison gang into a transnational operation with tentacles stretching through large swathes of Latin America, the United States and even across the Atlantic to Spain.