STORY: The Attorney General's office said in a statement that one other person was sentenced to 12 years in prison, six to 10 years, one to five years and six to three years while five were acquitted and three others died before their case came to trial.

Islamic State's Libyan branch was one of the militant group's strongest outside its original territory in Iraq and Syria, taking advantage of the chaos and warfare that followed a 2011 NATO-backed uprising.

In 2015 it launched an attack on the luxury Corinthia Hotel in Tripoli, killing nine people, before abducting and beheading dozens of Egyptian Christians whose deaths it featured in grisly propaganda films.

After gaining territory in Benghazi, Derna and Ajdabiya in eastern Libya, the group seized the central coastal city of Sirte, holding it until late 2016 as it enforced a harsh regime of public morality backed up by brutal punishments.