The United States has promised more than $12mn in aid for refugees fleeing growing violence in Cote d'Ivoire.
Opposition fighters have reportedly seized the town of Tou-lep-leu, previously held by troops backing Gbagbo.
It is said to be the third town that the rebels have taken.
Fighting between supporters of Gbagbo and those of his rival Alassane Ouattara is now the worst since the 2002 civil war.