FedEx could learn Friday what happened to a package containing radioactive materials that went missing a day before.
The company said it is searching in the Tennessee area and that the item is safe as long as nobody tampers with the protective packaging around it.
The item is a cylinder containing rods used for hospital machinery that were being sent to a person in Knoxville, Tennessee, said Sandra Munoz, a company spokeswoman.
"The rods are used for quality control calibration," Munoz said. "We have lots of experience in handling this kind of shipment."
Munoz said the company may learn more Friday morning when two employees who handled the shipment return to work.