Being contained by the upper border of the falling price channel on 4-hour chart, GBPUSD pulls back from 1.6441 level, suggesting that a short term cycle top is being formed. Key support is now located at 1.6286, a break below this level will confirm the cycle top and indicate that the fall from 1.6441 is resumption of downtrend from 1.7042, then deeper decline could be seen to re-test 1.6113 previous low support.