Looking at its chart, i would think that bitcoin fell because it wasnt able to stay within or break upwards from a triangle that had formed with higher lows and lower highs. Price just stagnated until it was outside the bottom of the range and then fell off. News may have contributed (it usually does) but i think there is a lot of expectation out there that bitcoin and other cryptos will explode off into space again and they keep disappointing people with those views, which brings disillusion for some holders who just get out.