(CNN) -- Emergency crews called off a search in Texas for the wreckage of a C-17 transport plane after reports Monday of a possible crash proved unfounded.

Callers to the Olney Police Department said they saw a low-flying plane, and a spokesman for Sheppard AFB initially reported a crash, but then retracted the report.

Air Force officials said an Air Force C-17 had been flying at low altitude near Olney, but the plane returned safely to Altus Air Force Base in southwest Oklahoma.

CNN's Mike Mount and Adam Levine contributed to this story.