MISSOURI: A kidnapped boy missing for four years may have posted messages on a website created by his desperate parents to find him.

One read "How long are you planning to look for your son?"

Shawn Hornbeck, 15, was said to have access to his alleged kidnapper's computer while the man was at work and may also have put photos of himself online in a series of postings under the name "Shawn Devlin".

Devlin is the last name of the suspect who it's claimed posed as his dad in Kirkwood, Missouri.

Investigators would not comment on the postings, including some sent to the Shawn Hornbeck Foundation, set up by his parents, Craig and Pam Akers.

Shawn, now 15, was 11 when he was kidnapped in 2002 while riding his bike near his home.

Astonished police found him on Friday in a flat where they also found 13-year-old Ben Ownby, who had been missing for four days.

Their alleged abductor, Michael Devlin, a 41-year-old pizza shop employee, is in custody.

So far, he is charged only over the kidnapping of Ben, but authorities also plan to charge him with abducting Shawn.

Neither boy has spoken publicly about what happened, but in a TV interview with the Ownby family, Ben thanked a classmate who told police of a white pick up truck, information that led police to him.

Devlin's lawyer, Michael Kielty, said he will enter a not guilty plea at a hearing later this week.