Iraqi riot police opened fire Tuesday amid clashes with anti-government protesters on a central Baghdad highway, killing one person and wounding over a dozen people, officials said, the latest since violence erupted again last week between demonstrators and security forces. The clashes on the key Mohammed al-Qassim highway broke out when riot police moved in to disperse a crowd of mostly young men who had gathered there. The protesters burned tires, halting traffic along the key artery and some protesters hurled Molotov cocktails, or fire bombs at the riot police.