Forces loyal to one of Ivory Coast's rival presidents, Alassane Ouattara, have captured the administrative capital Yamoussoukro, residents have said.

Fighting erupted when they later entered the key port of San Pedro on their advance from the north against incumbent leader Laurent Gbagbo.

The United Nations, which recognises Mr Ouattara as winner of November's poll, has voted to impose sanctions on Mr Gbagbo's circle.

The BBC's Laura Trevelyan reports.