PORTLAND -- New details are emerging about the day 7-year-old Kyron Horman disappeared from his Portland school over a month ago.

According to a new one-on-one interview with the missing boy's biological parents conducted by The Oregonian, Kaine Horman and Desiree Young say on the day Kyron disappeared, Kyron's stepmother, Terri Horman, sent several emails toYoung that led herto feel something was wrong.

Instead of her usual long, chatty messages, these were one sentence e-mails that Young called strange.

She e-mailed me three of four times that day, which is kind of strange, Young told The Oregonian.

Both said Terri Horman's behavior and everything they've learned about her since the disappearance have made them more suspicious.

I talk about red flags that came up, Young said. The first one was the phone call and talking to her right after he went missing. Just feelings with e-mail and our interactions, and communications with her.

It's as if she didn't even have a missing son, Kaine Horman said of his now-estranged wife.

Meanwhile, the Multnomah County Sheriff's Office announced Tuesday it is doubling its reward for information about Kyron's whereabouts from $25,000 to $50,000. An anonymous donor is funding the reward.

Significant progress in this case is occurring in that tips are being reviewed, leads are either being considered, worked or have been ruled out, sheriff's Capt. Monte Reiser said at a Tuesday news conference.

He declined to offerdetails about the investigation, but saidinvestigators are prepared for a long-term effort in the search for Kyron.

In a Dateline NBC interview that aired Monday, Kaine Horman acknowledged he had an affair with Terri when Desiree was eight months pregnant with Kyron. He also told The Oregonian that Terri Horman made completely false statements to friends when their relationship began, saying he hired her to take care of Kyron.

Both Kaine Horman and Desiree Young suspect Terri Horman had something to do with the second-grader's disappearance. Investigators say Terri Horman was the last person to see Kyron alive when she dropped him at a science fair at Skyline Elementary School in northwest Portland on June 4.

The case has taken many twists in the weeks since, many of them centered on Terri Horman. She has not been named as a suspect in Kyron's disappearance, and she has never spoken publicly about it.

Kaine Horman filed for divorce from Terri Horman in late June, claiming he believes she has information about his son's disappearance. He also says investigators told him that last year Terri Horman tried to hire somebody to kill him. The alleged plot was uncovered during the investigation into Kyron's disappearance, Kaine Horman's court filing said.

Terri Horman hasn't been charged with anything, and her attorney, Stephen Houze, has repeatedly declined to comment. However, he said in court earlier this month Terri Horman is being subjected to a witch hunt.

Court documents also say Terri Horman engaged in a sexual relationship with a former acquaintance of her husband's during the initial days of the search for Kyron. The relationship included the exchange of lurid images by cell phone, or sexting, court records said.

Kaine Horman was granted a court order to have Terri Horman leave the family home. She has reportedly been living in southern Oregon with her parents. Meanwhile,a Multnomah County grand jury investigating Kyron's disappearance on Monday subpoenaed Terri Horman's close friend DeDe Spicher. Spicher's attorney, Chad Stavely, said Spicher was asked no questions but told to return, possibly within a few weeks.

During a Tuesday news conference, Desiree Young tearfully addressed her son, telling him not to give up hope, while investigators doubled a reward for information in the case.

We love you Kyron. Never give up hope. We are all coming to get you to bring you home, sobbed Young.

In a round of interviews Tuesday, Young and Kaine Horman repeated their belief that Kyron is alive and will be returned to them. Young added she believes Kyron is hidden somewhere.

We feel very positive, she said. It's getting there.

Young and Kaine Horman,who stood behind authorities at the Tuesdaynews conference,said they are confident investigators are on the right track and that it's only a matter of time before they piece together what happened.

Our goals are to expedite the search for Kyron, to bring him home as quickly as possible, and to bring justice to any person responsible for his disappearance, Young said.

If you have any information about Kyron Horman's whereabouts, please call the Multnomah County Sheriff's tip line at (503) 261-2847.

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