LONDON, July 30 : The yen surged against the dollar on Thursday, in a move so rapid and large in its scale that it alerted investors to the prospect of intervention by Japan to prop up its weak currency. Markets have been on alert for yen-buying by Japanese authorities, who have warned of action for months a

July 30 : The dollar sank against the Japanese yen on Thursday with traders alert to the possibility of intervention from Japan to prop up its stubbornly weak currency. The dollar…

Having collapsed to its weakest relative to the dollar in 40 years...

Japanese currency spikes to highest level since May after prolonged decline

By Jessica Fleetham and Megumi Fujikawa