Egyptian Vice-President: 'The door is open'
Rival protesters have clashed outside the presidential palace in the Egyptian capital, Cairo, as unrest grows over a controversial draft constitution.
Stones were thrown and supporters of President Mohamed Morsi dismantled tents set up by anti-Morsi protesters.
Vice President Mahmoud Mekki has said a referendum on the draft will go ahead on 15 December despite the unrest.
But he indicated that changes could be made after the vote, saying the "door for dialogue" remained open.