LONDON (AP) — Chanting G-20 protesters clashed with riot police in central London on Wednesday, overwhelming police lines, vandalizing the Bank of England and smashing windows at the Royal Bank of Scotland. An effigy of a banker was set ablaze, drawing cheers. More than 30 people were arrested after some 4,000 anarchists, anti-capitalists, environmentalists and others clogged London’s financial district for what demonstrators branded “Financial Fool’s Day.” The protests were called ahead of Thursday’s Group of 20 summit of world leaders, who hope to take concrete steps to resolve the global financial crisis.