Supporters of Islamic State, the militant group that has overrun parts of Iraq and Syria, have killed 14 Libyan soldiers in the south of the country, the official government said on Saturday.

In separate violence, forces loyal to the internationally recognized government staged air strikes on the port of Misrata, a western city allied to a group that holds the capital Tripoli.

Both sides also fought with ground troops near the country’s biggest oil port, part of a struggle between forces loyal to two rival governments allied to former rebel groups that helped oust Muammar Gaddafi in 2011 but now vie for power. […]