PHOTO: REUTERSTHE YEN edged closer toward a key level against the US dollar, raising concerns over Japanese authorities stepping in again to prop up the currency. The Japanese currency ended the session little changed after falling as much as 0.1 per cent to touch 159.39 per US dollar on Tuesday. The drop had traders bracing for the currency to touch 160 per US dollar, a level which has contained yen weakness in the past. “If USD/JPY were to break decisively above the psychologically important 160 level, concerns about intervention could intensify further,” Masayuki Nakajima, senior strategist at Mizuho Bank, wrote in a note. The yen is down 0.14 per cent against the Singapore dollar in early Wednesday trade, at 124.46 per Singapore dollar.