While a number of other factors contributed to the market's gyrations, including data, corporate supply, stocks, commodity prices, technicals and rumors, the underlying bid came from fear. Treasuries opened slightly weaker, despite overnight declines in stocks. Launching of two jumbo corporate deals ($7 billion total) pressured bond slightly. But it wasn't long before the safety bid gave bonds a boost. A weaker than expected factory orders report added to demand.
News wire reports of an alert at a Georgia nuclear plant sparked size buying in 10-year notes, and technicals extended the rally into the close.