TRIPOLI - Libyan forces battling to oust Islamic State from Sirte said they had made significant advances on Wednesday, gaining control of a large convention center previously used as a base by the jihadist group. 'Our forces have complete control of the whole of the Ouagadougou (convention) complex - they even advanced some distance beyond the complex,' said Rida Issa, a spokesman in the forces' media office. Fighters also captured Sirte's hospital and university complex, he said.