Last week ended on September 13 at $476, after a week of flat activity in the $470-$480 range. The Bitcoin price remained in that range for the first day of this week, September 14, but began falling on the night of Monday, September 15. Between the hours of 6 PM and 8 PM, the price fell from $476 to $468. After this drop, the price embarked upon a steady, downward slide.
On Tuesday, the 16th, the price went from the low $470s to the low $460s. Then, on the 17th, the price began falling faster. Between 3 AM and 6 AM, the Bitcoin price fell from $462 to $455, and was in the $440s by the afternoon.
The 18th started out in the high $440s to low $450s range, but took a drastic downward turn in the early morning hours. At 7 AM, the price dropped from $449 to $441, and dipped into the $430s at 8 AM. The price continued to fall well into the afternoon; by noon, the price was in the $420s, and fell all the way to $407.94 at 2 PM
http://www.coinfinance.com/news/a-brief-report-on-recent-bitcoin-price-activity