Al Jazeera's Sue Turton, reporting live from the Libyan capital, Tripoli, said there has been "phonetic activity" inside Muammar Gaddafi's compound in Bab al-Aziziya.

"What we are hearing is that in the school in the compound ... that there have been snipers, we think, in those trees.

"That is what the rebel soldiers are telling us and they have sent as much artillery in there as they possibly can ... to try and take those snipers out," she said.

Watch our correspondent's live report from inside the centre of Gaddafi's compound.