OAKLAND TOWNSHIP, Mich. - The excavation of a field in suburban Detroit has failed to turn up the remains of former Teamsters union leader Jimmy Hoffa, the FBI announced Wednesday, adding another unsuccessful chapter to a nearly 40-year-old mystery.

"We did not uncover any evidence relevant to the investigation on James Hoffa," said Robert Foley, head of the FBI in Detroit.

Authorities have pursued multiple leads as to Hoffa's whereabouts since his disappearance in 1975.

Tiger Woods' sore left elbow will keep him out of competition until the British Open.

"I was examined after I returned home from the U.S. Open, and the doctors determined I have a left elbow strain," Woods said.

Woods began flexing his left wrist after hacking several shots out of the thick rough at Merion during the first round of the U.S. Open.