GBP/USD declines over 0.50%, with sellers targeting further lows after breaking past 1.2644.Bearish momentum confirmed by RSI; GBP faces key supports at 1.2600 and 1.2486.Potential recovery hinges on surpassing resistance at 1.2700 and 1.2818 (200-day SMA). The Pound Sterling tumbled over 0.50%