[Yen Suddenly Surges, Traders Alert to Intervention Risks] The yen-to-dollar exchange rate has just suddenly spiked, prompting traders to be wary of potential intervention from Tokyo to prevent the yen from falling to or near multi-year lows. The dollar-yen pair briefly dropped to 157.33 and is now down 0.13%, trading at 158.17. Earlier, the pair had risen by about 0.5%. It is currently unclear what caused this movement or whether Japanese authorities have initiated yen-buying intervention. Japan's Ministry of Finance has yet to comment.