U.S. Treasuries snapped a 3-day advance on Wednesday before an auction selling $35 billion in 5-year notes, the second auction of three this week totalling $97 billion. The U.S. benchmark 10-year government bonds yielded at 2.66% at 6:49 a.m. London time, while the Bloomberg US Treasury Bond Index has gained 0.8% this month, but it is still down 2.5% in the whole 2013.