Seoul leads broad Asia equity drop after N. Korea test

South Korean stocks and the won led most Asian markets lower Friday after the North conducted another nuclear test, while trading was also hit by worries over global central bank policy easing. Pyongyang said it had conducted a "successful" fifth nuclear test, which South Korea said was its largest-ever. The news intensified worries about geopolitical tensions in the region as world powers including China struggle to rein in Pyongyang's erratic behaviour.