Cisco report knocks stocks

NEW YORK (AP) — Stocks tumbled Thursday after a disappointing outlook from Cisco Systems Inc. rattled a market already on edge as an economic summit of world leaders got under way in South Korea. Global leaders were sharply divided over currency and trade policies heading in to the Group of 20 summit meeting in Korea, and a sense of pessimism was hanging over the start of the meeting of top officials from rich and emerging economies.