A Toledo-area couple whose son has been missing for a month and may be held for ransom announced a $250,000 reward for information regarding his disappearance.

Tom and Pamela Wiles said at a news conference Thursday that $50,000 of the reward money is for information about the whereabouts of their son, 26-year-old Robert Wiles, while $200,000 is for information leading to the arrest of any kidnappers.

Tom Wiles owns the National Flight Services aviation service company with a location at Toledo Express Airport in Ohio.

Robert Wiles worked at the Lakeland, Fla., site, where he was last seen on April 1. FBI agents have said his parents received a ransom note two days after he disappeared.

The Wiles family complied with the note's demands, but no one has seen Robert Wiles since.