Khalifa Haftar's Libyan National Army (LNA) has launched a military operation to secure the southern border, it said on Friday, after fighting near the area resumed between the government of Chad and a rebel group trying to unseat it.
Chad's President Mahamat Idriss Deby said on Sunday that the army was again fighting the Libya-based Chadian Front for Change and Concord (FACT) group, which quit a ceasefire last week amid clashes.
LNA spokesperson Ahmed al-Mismari said the operation would involve land and air forces. An LNA media unit distributed photographs of Haftar's son, Saddam Haftar, overseeing the operation with other LNA officers.
The media unit said the LNA had expelled members of the Chadian opposition and their families from a residential area they were using in a desert town 300km (200 miles) north of the border with Chad.
Libya has had little internal peace or security since the 2011 NATO-backed uprising against Moammar al-Gaddafi, and its southern desert border has become a major transit route for trafficking networks.