Car bombs explode in Libya's Derma, at least six killed
Derna has been caught in fighting between Islamic State militants, rival Islamist fighters and armed forces with the country's internationally recognised government.
The eastern port city is just one front in a multi-sided conflict in the North African country, where two rival governments and various armed groups are fighting for control four years after the fall of Muammar Gaddafi.
(Reporting by Ayman al-Warfalli in Benghazi and Ahmed Elumami in Tripoli; Writing by Patrick Markey; Editing by Frances Kerry)