Three young activists have been found beheaded in Derna, in eastern Libya.

The three, who had relayed information about the city through social media, had been kidnapped earlier this month.

Several Islamist groups are competing for control of the city, with some militants recently declaring allegiance to Islamic State.

Libya has been in a state of flux since Col Gaddafi was overthrown in 2011, with disparate tribes, militias and political factions fighting for power.