GBPUSD broke above the downward trend line on 4-hour chart, indicating that the downtrend from 1.7190 (Jul 15 high) had completed at 1.6051 already. Further rise could be expected in a couple of days, and next target would be at 1.6700 area. Support levels are at 1.6410 and 1.6320, only break below these levels could trigger another fall towards 1.5800.