The Bank of Japan (BoJ) left its key short-term interest rate unchanged at -0.1% at its September meeting, as widely expected, hours after the Federal Reserve lowered rates for the second time this year. Policymakers also kept the target for the 10-year Japanese government bond yield at around zero percent but said they would review economic and price developments more thoroughly at the next policy meeting, heightening the chance of expanding stimulus as early as October.