The Derna Mujahadeen Shura Council (DMSC), the jihadi organization that controls the besieged city of Derna, stepped up its anti-ISIS operations throughout last week, arresting former ISIS members who had previously been detained or absorbed by the DMSC, and clashing with others (See ISIS in Action for more detail). On 17 December, fighting between the Libyan National Army (LNA) and DMSC fighters east of Derna is reported to have left one LNA fighter dead and another wounded. Heavy weapons are said to have been used in the clashes which took place in the Kassarat area.