GBPUSD broke below the upward trend line on 4-hour chart, indicating that the uptrend from 1.6051 had completed at 1.6524 already. Deeper decline to test 1.6283 support could be seen, a breakdown below this level will target 1.6100 area. Resistance is at 1.6420, only break above this level could trigger another rise towards 1.6700.