SAN DIEGO -- The Sheriff's Department and U.S. Marshal's office are searching for a convicted child molester they believe is in the area.

Charles Thomas, 67, was released from prison in January but has yet to register as a sex offender.

He had served four years of a 20-year sentence for the sexual exploitation of children.

A Sheriff's Department fugitive bulleting says Thomas "is a pedophile who has been molesting children since the early 1970s."

Officials say Thomas has used the aliases David Cohen, Steve Miller and Mark McKinney.

Authorities are asking for the public's help in locating Thomas, and a $1,000 reward is being offered for information leading to his arrest. The public is asked to call 888-580-TIPS.