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The dollar stabilised after sinking against its peers, while gold jumped back above US$4,500 for the first time since early June.
"The key question now is whether the fall in yields can last. If oil prices remain elevated and concerns over US borrowing continue, pressure on the long end of the Treasury curve could return," said City Index's Fiona Cincotta.
Crude prices have been rising for the past two weeks as hopes for a US-Iran deal to reopen the Strait of Hormuz fade - the deadline for an agreement came up this week.
Washington's naval blockade on Iran's ports and Tehran's attacks on commercial ships continue, and Iran's armed forces warned Gulf countries against assisting the US military on Wednesday.
While both sides recently said messages were being exchanged, Trump on Tuesday insisted talks were off, taunting Iran with a social media post depicting the strait as a "NEW US Territory".