Ailing Nelson postpones Fla. gig

CLEARWATER, Fla., March 17 (UPI) -- Singer Willie Nelson has postponed his Tuesday night concert in Clearwater, Fla., due to an undisclosed illness.

"Willie has postponed tonight's show at Ruth Eckerd Hall. At this time, it is unknown if the remainder of the March tour will be postponed," said a message posted on the 75-year-old singer's official Web site. "Please contact the individual venue for the most updated schedule. We are sorry for any disappointment this may cause."

The message said Nelson hasn't been feeling well since his concert last Friday in Lake Buena Vista, Fla.

No details about the recording artist's symptoms or diagnosis were given.