CAIRO — A Libyan court Monday sentenced 23 suspected Islamic State group militants to death for launching deadly attacks that killed dozens of people, including Egyptian Coptic Christians. The court sentenced nine defendants to between three and 12 years in prison. The Islamic State and other extremist groups exploited the chaos that engulfed Libya after the 2011 uprising that toppled and later killed longtime ruler Moammar Gadhafi. The militants were eventually expelled from Sirte in December 2016 by forces fighting for the former U.N.-backed Government of National Accord. Hundreds of alleged former Islamic State fighters remain incarcerated in Libyan prisons, many of whom are awaiting trial.