Kevin Giddis, head of fixed income at Raymond James, said the selling was triggered by a drop in weekly claims for unemployment benefits. But the bond market has been under pressure recently as investors expect the economy to improve and interest rates to rise next year. "It appears that the momentum trade for bonds is to take them to a lower price and a higher yield," said Giddis.
http://money.cnn.com/2013/12/26/investing/treasury-yield-3-percent/index.html?iid=HP_LN