Sixteen people, including civilians, were killed in clashes among rival armed groups in the Libyan capital Tripoli, the Health Ministry said Saturday, following the latest politically driven violence to hit the Libyan capital. Misrata is the hometown of both of the rival prime ministers who are vying for control of what remains of a central government. Ambassador Richard Norland called on all political actors and their supporters among armed groups to stand down to avoid escalation. The Tripoli clashes were between two armed groups with major clout in the west of the war-torn country: the Al-Radaa force and the Tripoli Revolutionaries Brigade. Libya has been gripped by insecurity since a NATO-backed uprising toppled and killed dictator Moammar Gadhafi in 2011, leaving a power vacuum armed groups have been wrangling for years to fill.