...as police gas protesters

RIOT police in Pittsburgh fired tear gas at anti-capitalist protesters yesterday as up to 2,000 activists barricaded the streets in an unauthorised demonstration.<br /><br />Police told the protest group, calling itself G20 Project Resistance, to disperse after they gathered a few hundred metres away from the convention centre.<br /><br />But the demonstrators reacted angrily, using rubbish bins and other debris to block the road, as police resorted to firing tear gas and letting off high-pitched sirens in an effort to drive them away.<br /><br />Soldiers in armoured vehicles were also posted on Pittsburgh&rsquo;s streets, while many shops and offices boarded up their windows in fear of attacks on property.<br /><br />Police said the protesters had not obtained a permit for their rally, but there were no reported arrests or injuries.