The civil war between Libya’s two main political camps has spread to the remote oil and water-rich south, drawing two minority groups into a proxy battle that threatens to deepen the country’s chaos.

In recent weeks, fighting has erupted between the powerful Tebu people and elements of the Tuareg minority in and around the southern city of Owbari, close to the El-Sharara oil facility, one of Libya’s largest.

Libya has been riven by a months-long conflict between armed forces and militias loyal to the elected government, temporarily located in the city of Tubruq, and the so-called Libya Dawn alliance of militias led by Islamists and warlords from Misurata, who have declared a rival government in Tripoli. […]