The forces loyal to military strongman Khalifa Hifter and the internationally backed Tripoli government have largely avoided direct conflict, until now.
ISIS took over Sirte in early 2015, turning it into their most important base outside the Middle East and moving large numbers of foreign fighters into the city.
Once ISIS is ousted from Sirte, government and aid agencies will face a huge challenge rebuilding infrastructure and re-establishing services, charity group says.
North African countries should cooperate to stop ISIS fighters who are fleeing Sirte from returning to their homelands and causing trouble there, Tunisia's defense minister says.
At least 38 fighters killed, 185 people wounded from fighting in Sirte, Islamic State's last major bastion in the country.
The Misrata-led brigades said there had been five attempted car bombings on Sunday in a 'desperate attempt to disrupt the advance.'
Islamic State fighters in Libya have abducted at least 540 refugees in six separate ambushes over the past 18 months. Many of the women captives are being turned into sex slaves to reward the extremist group’s warriors.
House Republicans pressing FBI to release notes from July interview with Clinton, claiming notes may show inconsistent answers to questions about her handling of emails containing classified information.
Government forces report advances after staging attacks by land, sea and air against ISIS militants, who are now encircled in city center.
A Newsweek report details how Islamist militants are mining World War II explosives buried in the Sahara sands for use in their wars in Egypt and Libya.