"I renew my call for Mr Gbagbo to step down and hand over power to ... Allasane Ouattara. I want to remind all those who commit serious violations of human rights ... will be held accountable," Ban told a news conference in the Kenyan capital.
"Mr Gbagbo should immediately cede power ... to Allasane Ouattara. Let us see how this accountability (issue) goes. He must first stop killing civilians and stop fighting against his people."