The former stepfather of a missing Vermont girl was arrested and authorities said Tuesday he would be charged with obstructing justice for destroying evidence.

Neither the FBI nor the head of state police discussed what evidence Ray Gagnon is alleged to have destroyed or whether that evidence was part of the investigation into 12-year-old Brooke Bennett’s disappearance or unrelated sexual assault accusations against him.

But Gagnon, 40, is set to appear today in federal court to answer the obstruction charge.

Gagnon had been scheduled to be arraigned Tuesday on a sexual assault charge involving a minor but the arraignment was canceled as federal authorities took over. At an afternoon news conference, state police head Col. James Baker said that case was still being investigated and the charge could be refiled.