New Delhi, Sept. 26 -- The yield on US government 30-year debt reached fresh multiyear highs on the last day of a bruising week after a gauge of consumer sentiment exceeded economist estimates.

The 30-year Treasury yield, which reached the highest level since 2004 on Thursday, rose as much as five basis points to 5.53 percent. It was below 5 percent as recently as early July. The 10-year note's yield also reached a fresh multiyear high exceeding 5.22 percent.

"There's no real technical levels for people to hang on to, and it leaves things in a bit of a vacuum," said Izaac Brook, US rates strategist at RBC Capital Markets. "That allows yields to just keep drifting higher and higher."

Longer-term Treasury yields climbed on Friday even as...