Crowley allegedly told authorities that he had buried the baby "somewhere in the mountains".
The search began at about 8 p.m. Saturday night, when 911 calls poured in about a man who was "acting strange" in the Lolo Hot Springs area. More calls came in to dispatch and said the man was threatening people, claiming to have a gun and kept reaching into his pockets. They soon learned that a five-month-old boy who had been left in Crowley's care had not been seen for several hours.
Crowley returned to the hot springs and was apprehended by police, the release states.
"When deputies tried to interview him, he appeared to be under the influence of drugs and was not making sense to the officers", she said.
Francis Carlton Crowley, 32, has been charged with criminal endangerment with additional charges pending, according to a Facebook post from the Missoula County Sheriff's Office.
A 5-month-old baby boy was found alive after being abandoned and surviving a 9-hour ordeal in the Montana mountains.
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A search was launched that included members of the county search-and-rescue team, the U.S. Forest Service, the federal Bureau of Land Management, the Montana Highway Patrol and the Missoula County sheriff's office.
A Missoula County Sheriff's spokesman said: 'For all of us at the sheriffs office, this is what we call a miracle. The little boy was wearing only a wet and soiled onesie, deputies say, and had been alone in the cold for at least nine hours.
"When we brought him out, we took him right to the hospital, he had some scratches and bruises but otherwise in good health", sheriff's office spokeswoman Bassett told ABC News. "For the officers who were present for this event, its especially hard knowing what this small baby endured in the last 24 hours".
No information has been released about the child's family except that Bassett said Crowley is not the biological father.
The nature of Crowley's relationship to the baby was not immediately clear. They say they won't be confirming names to protect the baby's identity. The infant was found at 2:30 Sunday morning when it was about 46 degrees outside.
More charges are forthcoming for Crowley, police said.
These latest charges aren't Crowley's first brush with the law.