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French daily Les Echos said, without citing its sources, that the rating agency would spare Germany, the Netherlands, Finland and Luxembourg in its long-awaited adjustment of euro zone sovereign ratings.
It said the announcement would come at around 2130 GMT.
Benchmark 10-year Treasury notes were up as much as 26/32 at 101-15/32 in price with a yield of 1.84 percent. They last traded at 101-11/32, up 22/32 on the day with a yield of 1.85 percent, according to Tradeweb.