The arms race between rival Mexican drug cartels is showing no signs of slowing down. Police have seized the second "narcotank" in a month from the Zetas cartel, CNN reports. The home-made tank—a Ford truck with steel plating, gun ports, a rotating turret, and a battering ram—was found abandoned by a rural road after a clash between rival gangs left five people dead. Another tank, dubbed "El Monstruo 2011," was grabbed by police earlier this month. (More Zetas stories.)