$100,000 reward posted in Idaho Amber Alert case
 |  Still missing: Siblings Shasta and Dylan Groene. |
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| | HOT LINE | A sheriff's hot line has been established for any information about the case: 208 446-2292 or 208 446-2293.
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VIDEO |
 Authorities hope a home video will help find two siblings.
 Amber Alert issued for two children in wake of triple slaying.
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COEUR D'ALENE, Idaho (CNN) -- Hoping to generate new leads in a case that has puzzled investigators, authorities on Monday announced a $100,000 reward for information leading to the safe return of the two missing children in Idaho or for information that could lead to those responsible in their presumed abduction.
Nine-year-old Dylan and 8-year-old Shasta Groene have been missing since last Monday, when their mother, one of their brothers and their mother's boyfriend were found beaten to death in the mother's home.
Authorities have said they have no suspects in the killings or in the children's apparent abduction.
The reward money is being posted by the federal government. Kootenai County Sheriff Rocky Watson said the county also is posting an additional $7,500.
"What we're trying to do is generate information which will help us continue our investigation," FBI special agent Tim Fuhrman told reporters. "This is just another tool in our bag to generate that information and give us what we hope is a happy resolution to this particular situation."
People with any information are urged to call a hot line at 208-446-2292 or 208-446-2293, or e-mail kcgovtips@hotmail.com.
Watson said authorities have received more than 900 tips so far, but they hope the substantial reward money will give them "more tips, more leads as this investigation proceeds."
"I have a need to believe those children are still alive," Watson said.
Earlier, Kootenai County Sheriff spokesman Ben Wolfinger said the father of the two missing children is not a suspect "or even a person of interest" in the case.
"We don't have any person of interest," he said.
His comments followed a televised interview Sunday night in which the father, Steven Groene, said an FBI agent told him he failed "portions" of a polygraph test and that there were doubts about his innocence. Groene was divorced from the children's mother.
"It's pretty devastating to have to hear somebody say that they think you know something about this," the father said on Fox's "At Large with Geraldo Rivera."
Wolfinger told reporters a polygraph "measures the physiological response" of the subject.
"This man is extremely emotional, and very understandably so," he said.
The coroner's office has said Brenda Groene, 40, her boyfriend Mark McKenzie, 37, and her 13-year-old son, Slade, died of blunt force trauma to the head. The victims had been bound. (Full story)
The last time they were seen alive was Sunday, May 15, when they had a get-together with friends at the home.
The children's aunt, Wendy Price, tried to comfort her niece and nephew Saturday by telling them to "hang in there" -- with the hope they could hear her. (Full story)
She also urged whoever may have taken the children to turn themselves in and hope for "compassion."
Addressing the children, Price said: "We're going to find you soon, and just hold comfort in that, and we know that your brother is watching over you right now, and so is your mother."
