 This is Paul Henley with NewsHour, live from the BBC. Anti-government demonstrators have returned to the streets of the Kenyan capital, Nairobi, in defiance of warnings by the authorities. The Kenyan police put up roadblocks on streets leading to the presidential palace, as some of those on the street vowed to occupy it. In some places, the police fired tear gas to try to disperse the crowd. GUNFIRE