South Africa’s Mail and Guardian reports that Nobel Peace laureate Wangari Maathai on Tuesday urged Kenya's bickering political leaders to show restraint in a crisis of authority that has raised fears of unrest in East Africa's most stable nation. Hoping to trade on respect earned when she won the 2004 Nobel Peace Prize, Maathai urged Kenyan President Mwai Kibaki and the opposition to cool tensions that erupted after last week's rejection of a new Constitution. "Leaders must now remove the barrier which divided Kenyans and now threatens justice and security," she told reporters at a news conference in Nairobi.