The Commander of the self-styled Libyan National Army, Khalifa Haftar, has been on a visit to Egypt over the last couple of days as part of as what has been referred to as "joint coordination between Egypt and the army leadership in the fight against terrorism".
According to an official, who spoke on condition of anonymity, Haftar arrived in Cairo late on Wednesday and held a series of meetings with senior Egyptian officials to discuss the political and military developments in Libya, pointing out that the talks touched on the issue of coordination in the fight against terrorist groups.
"There is coordination at the highest level between the Libyan National Army and the Egyptian authorities in this regard," he said.
In the meantime, an official source said that "the National Army is in the process of large-scale military operation in the next few days to begin the liberation of the city of Derna," which is the main stronghold of terrorist groups in eastern Libya, and added that "preparations [for the operation] are nearing completion".
Haftar's eastern-based LNA, one of a number of factions that have vied for power in Libya since a 2011 uprising ended Muammar Gaddafi's four-decade rule, is waging a military campaign against a coalition of militants and ex-rebels known as the Derna Mujahideen Shura Council (DMSC) that controls Derna.
Attention has shifted to the coastal city after Haftar announced victory in a three-year military campaign against a similar coalition in Benghazi, 350 kilometres to the west, in July last year.
In May, the city was also a target of Egyptian air strikes. Egypt said it was responding to an attack against Coptic Christians on its territory, though that attack was claimed by Daesh.