PORTLAND, Ore. (AP) -- Investigators have asked journalists for footage of interviews with people who reported seeing a missing 7-year-old Portland boy after the time his stepmother says she left him at school.

The Multnomah County Sheriff's Office asked local and national news organizations on Thursday to send in copies of any video interviews with students, parents, school officials or community members who reported seeing Kyron Horman after 8:45 a.m. on June 4.

Multnomah County Sgt. Travis Gullberg says the sheriff's office won't issue subpoenas and says release of the material is voluntary.

The boy vanished after a science fair at Skyline Elementary School on June 4. His stepmother, Terri Horman, was the last person known to have seen him.

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