GBPUSD broke below the upward trend line on 4-hour chart, indicating that the uptrend from 1.4950 had completed at 1.5551 already. Further decline could be expected, and next target would be at 1.5100 area. Resistance levels are at 1.5460 and 1.5551, only break above these levels could trigger another rise to 1.5650 zone.