Lawmakers, officials, military leaders, and foreign mission chiefs from North Atlantic Treaty Organisation member states are among the participants at the meeting, set to end Sunday.
Egypt's President Abdel-Fattah El-Sisi discussed on Sunday with Field Marshal Khalifa Hafter, commander of the Libyan Armed Forces, the latest developments in Libya and Egypt's keenness to see unity, stability and security in its neighbouring country, presidential spokesperson Bassam Rady said.
So far, the LNA have ignored worldwide calls to halt their battle against fighters loyal to the Government of National Accord led by Fayez Al Sarraj in Tripoli. Islamist militants have since controlled large parts of the vast country, including the capital Tripoli.
"The World Health Organization strongly condemns repeated attacks on healthcare workers, vehicles and facilities", WHO tweeted'.
WHO's Libya Twitter account posted an update of "casualties" and said it was "sending medical supplies, health staff support for first- and second-line responders".
The U.N. Office for the Coordination of Humanitarian Affairs said more than 13,500 people have been displaced, and that "significant numbers of civilians" remain stuck in areas where the fighting has escalated. Both sides have carried our airstrikes in the town, and a spokesman for the Libyan National Army said it has stepped up airstrikes on its rivals in the past two days.
"UNSMIL warns that the bombing of schools, hospitals, ambulances and civilian areas is strictly prohibited by International Humanitarian Law", the Mission said in a statement.
Egypt has close ties with Haftar, whose LNA controls the east and swept through the mainly desert south earlier this year before moving to Tripoli 10 days ago in a major escalation of conflict.
On Saturday, the Tripoli-based Interior Minister of the Presidential Council's government Fathi Bashagha accused the United Arab Emirates (UAE) of reportedly sending Haftar military support in "clear violation of the global law".
Libya, which has been mired in chaos since the NATO-backed toppling of longtime ruler Muammar Gaddafi in 2011, has been split into rival eastern and western administrations since 2014.