Earlier in the afternoon, benchmark 10-year U.S. Treasury notes yielded 1.5975 percent during Friday's trade. Thirty-year Treasury bonds yielded 2.3059 percent. Bond prices move inversely to yields (CNBC explains).
Prime Minister Binali Yildirim said a group within Turkey's military had attempted to overthrow the government and security forces had been called in to "do what is necessary."
"Some people illegally undertook an illegal action outside of the chain of command," Yildirim said in comments broadcast by private channel NTV and reported by Reuters.
Prior to the headlines out of Turkey, bond prices traded lower on Thursday, as German Bunds declined and French OATs gained following a terror attack in Nice.
The yield on German 10-year Bunds became positive for the first time since June 23, hitting a high of 0.007 percent. It was last roughly flat at 0.004 percent.