The Japanese yen recorded its strongest one-day gain against the U.S. dollar in nearly two years after suspected intervention by Japanese authorities. The move adds to a long history of currency market interventions, from the Plaza Accord to recent efforts to curb excessive yen volatility.

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

Japanese currency spikes to highest level since May after prolonged decline

Coordinated actions seen as joint effort to curb yen weakness