Will not bring to us our knees. Irans Supreme Leader reacts to the talks. And robots used to chart the extent of global warming. Its been a night of the worst rioting in months in a midwestern town, the focus of racial tensions in the u. S. Police say they have had to use tear gas, been shot at and arrested 29 people. They have confronted crowds of angry protesters on the streets of ferguson missouri. Violence broke outs after a decision not to charge a white policeman who shot dead an unarmed black teenager. This report from daniel lak. Violent protests erupt in ferguson. Crowds set fire to buildings and cars. Police say theres heavy gun fire. Officers respond by firing tear gas and smoke cannisters. Senior Police Officers told a latenight News Conference the violence was at a shocking level. A lot of gun fire. Im disappointed in this evening. I really dont have hesitation in telling you that i didnt see a lot of peaceful protests out there, and im disappointed. Im not saying there we