U.S. Treasurys pared earlier gains on Friday as a U.S. sell-off equities subsided on reports that Russia had ended military exercises near the Ukrainian border.
Benchmark 10-year Treasury notes, whose yields hit a 14-week low of 2.349 percent earlier, were 1/32 lower in price and yielding 2.42 percent.
Thirty-year Treasury bonds also pared gains and were last down 5/32 in price to yield 3.23 percent. The long bond on Friday had yielded as little as 3.178 percent, its lowest since June 2013.
Price gains in shorter maturities were muted.
Treasurys rallied earlier U.S. air strikes in Iraq fueled investor anxieties already heightened by the Ukraine crisis, tit-for-tat economic sanctions between Russia and the West, and Argentina's unresolved debt default.
Fighting also resumed in Gaza between Palestinian militants and Israel.