"The Secretary-General is particularly disturbed by the high number of fatalities as well as reports of summary executions of civilians, which, if confirmed, may constitute war crimes," said a statement.
News reports suggest that perhaps more than 140 people have died as a result of Thursday's attack on the airbase, mostly soldiers but also civilians. This is the latest flare-up of violence in the North African nation since the civilian uprising in 2011.
Mr. Guterres urges all key Libyan stakeholders to re-commit to the political dialogue and engage constructively towards that goal.
"The Secretary-General appreciates the efforts of a number of regional and neighbouring countries for their contributions aimed at strengthening the dialogue between key stakeholders in support of the overall UN-led process," the statement concluded.
PL/MNA