High Demand for the 10 Year Treasury Note

The bid to cover came in 3.28, higher demand for the 10 year Treasury notes. This caused a drop in the 10 year yield (as prices rose) and a pop in futures.

The one question that I have, is, why would there be huge demand for 10 year notes? Are investors taking the risk-play off the table? You would think that this would not be good for stocks, but I'm not an economist, so take it for what it is -- food for thought!