 There's been more violence on the streets of Kenya's cities, with police once again firing tear gas at protesters. Wednesday had seen the country's president, William Ruto, cave in to the protesters' demands and cancel a controversial tax bill. But if he thought this would put an end to the trouble, he was, it seems, badly mistaken. And now the Kenyan high court has ruled that the president has the right to send in the army to help regain control. From Nairobi, our Africa correspondent, Barbara Plett-Usher, has this report.