A 15-year-old was placed in juvenile detention for questioning after two of his brothers were found dead in West Point, Utah, Thursday night.

His mother found her 4-year-old son dead inside their home, and authorities later found her third son, age 10, also killed.

"It appears they did from a knife like wound," said Sheriff Todd Richardson.

The 15-year-old ran away from home, but police found him right after midnight, according to ABC News. Richardson said the teen "had some wounds." The teenager was questioned and Richardson said that he was placed in a juvenile facility in Davis County.

"He acted alone," he said. "There are no others at large."

Their father, who serves in the military, has been alerted about the incident and is reportedly returning to West Point. Students at West Point Junior High, where the 15-year-old attends, were surprised about the boy's alleged actions.

"This is really hard to understand," said one student who said she sits next to him in a science class. "He is very friendly and always talking about school work and he's very smart."

The bodies of the 4-year old and 10-year old were removed from the house early Thursday morning and taken to the medical examiner for an official autopsy report.