Supporters of Alassane Ouattara had planned to march on the offices of state TV, which has praised Laurent Gbagbo.
At least 20 people have died in Ivory Coast in clashes between troops and demonstrators, says a spokeswoman for incumbent president Laurent Gbagbo.
International pressure is growing on Ivory Coast incumbent President Laurent Gbagbo to cede power to opposition leader Alassane Ouattara after last month's disputed presidential election.
French President Nicolas Sarkozy says Mr Gbagbo must stand down by "the end of the week" or face EU sanctions.
Kenyan Prime Minister Raila Odinga has called for African nations to remove Mr Gbagbo by force if necessary.
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