The Bank of Japan added 10 trillion yen ($118 billion) in liquidity injections after a surge in the nation’s currency to a 15-year high threatened economic growth. The BOJ boosted the facility to a total of 30 trillion, the bank said in a statement after an emergency meeting in Tokyo. Governor Masaaki Shirakawa said in a press briefing that the bank is ready to take more action if necessary, and cited risks to its view that the economy will remain on a recovery track.