Pro-government forces in Libya said they seized control of the Islamic State group's headquarters in Sirte on Wednesday as they push to oust the jihadists from the coastal city.
"The Ouagadougou centre is in our hands," the operations centre for forces loyal to Libya's Government of National Accord (GNA) said.
Reda Issa, a spokesman for the forces, said IS jihadists remain in three residential areas of the city and in a villa complex near the seafront.
"The announcement of the liberation (of Sirte) will only be made once the entire city is liberated," he told AFP.
Capturing the Ouagadougou centre has been the key goal of pro-GNA forces as they have battled for weeks to oust IS from Sirte, which the jihadists seized in June last year amid the chaos that followed the 2011 ouster of Moamer Kadhafi.
The city's capture raised deep concerns in the West, with fears the jihadists were gaining an important foothold just across the Mediterranean from Europe.
Loyalist forces stepped up their fight for the city in recent days, and the Pentagon announced last week it had begun carrying out air strikes on IS positions in Sirte at the GNA's request.