AUSTIN, Texas (AP) — Former day care owners who spent 21 years in prison before being freed amid questions about their convictions on charges of child abuse involving satanic rituals say they want a formal exoneration.

But the Austin American-Statesman reported Sunday that prosecutors are so far not inclined to declare Dan and Fran Keller innocent. The former couple was convicted in 1992 and released last year.

The Kellers had been sentenced to 48 years in prison after therapists testified that they helped three children recover memories of satanic rituals and sexual abuse at an Austin preschool the couple operated.

Travis County prosecutors agreed to release the couple on bond last year after new questions were raised about evidence in the case. But they say there isn't sufficient evidence to declare them innocent.