LIBERIA must be held accountable for its support of rebel forces in Sierra Leone, Nigeria’s Foreign Minister Ignatius Olisemeka said on Wednesday. He said Nigeria might take the Liberian government to an international court.Speaking to reporters after meeting the United Nations envoy to Sierra Leone, Olisemeka said Liberia “should be held fully accountable” for aiding the rebels opposed to Sierra Leone President Ahmad Tejan Kabbah. Liberia denies the Nigerian claims.