Street fighting has raged in Sirte for a second day as troops loyal to Libya's transitional government confront the remnants of ex-leader Col Muammar Gaddafi's forces.
Interim authority forces seized control of a key boulevard, isolating a conference centre where Gaddafi loyalists have been holed up.
Thousands of civilians remain trapped.
Once Sirte falls, Libya's leaders say they will declare liberation, even if Col Gaddafi remains on the run.
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