USDJPY extended its downside movement from 110.48 to as low as 107.40, facing the 107.31 (Sep 8, 2017 low) support. The key resistance is at the top trend line of the price channel on the 4-hour chart. As long as the channel resistance holds, the downside move could be expected to continue, and a breakdown below 107.31 support could take price to 106.00 area. Only a clear break above the channel resistance could signal completion of the downtrend.
