Firefighters responding to an electric vehicle fire near Arapahoe Road and Waco Street in Arapahoe County urged nearby residents to take precautions against smoke Tuesday morning. South Metro Fire Rescue said people within a half-mile of the fire should close their windows and doors and turn off their heating and cooling systems while crews worked at the scene. The vehicle was producing thick, black smoke. Investigators were alerted to the fire shortly after 7 a.m. Arapahoe Road was closed in both directions during the response. Officials had not provided an estimated reopening time. The cause of the fire was under investigation. It was not immediately clear whether anyone was injured.