Boy arrested after shooting that killed 4 in small Utah town

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Police investigate after four people were killed and fifth person was injured in a shooting at a Grantsville, Utah, home Friday, Jan. 17, 2020. The suspected shooter was taken into custody by Grantsville police, the Deseret News reported. Grantsville Mayor Brent Marshall said the victims and the shooter are all related, the newspaper reported. (Steve Griffin/The Deseret News via AP)

A boy armed with a gun killed three children and a woman inside a Utah home, then accompanied a fifth victim to a hospital, where he was arrested, police said Saturday.

Police were still trying to piece together who's who and what happened leading up to Friday night's shooting in Grantsville. Investigators believe the victims are all related to one another, and officials declined to release information about the shooter other than he is a juvenile male.

“We're trying to make certain that we verify people's relationships among the deceased and the survivor,” Grantsville Police Cpl. Rhonda Fields told The Associated Press Saturday. “As for motive, we don't have any of that.”

It appears to be the largest mass shooting in Utah since 2007, when a shotgun-wielding gunman killed five people and himself at Trolley Square mall in Salt Lake City. It's also the first homicide in nearly 20 years in Grantsville, a town of 11,000 about 35 miles (56 kilometers) west of Salt Lake City.

“It's been a very long time,” Fields said.

The boy faces 10 charges, the most serious being aggravated homicide, she said. Police were not able to release his identity because he has been charged as a juvenile.

Officials said he is the only suspect. His relationship to the victims was not immediately clear.

The names of the victims have not been released, and their identities may not be publicly known until Monday, Fields said.