A 12-year-old boy was arrested in Texas on a murder charge Saturday after authorities said he fatally shot his younger brother.

The 10-year-old victim was transported to a hospital where he succumbed to his wounds, Lt. Scott Spencer with the Montgomery County Sheriff’s Office said.

Spencer said deputies found the boy after responding to a report of a shooting at a home in Conroe Saturday afternoon.

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The boy was shot in the chest, he said.

“Our thoughts and prayers go out to the family and friends of the 10-year-old victim,” Spencer said.

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The sheriff’s office announced that the 12-year-old had been charged with murder seven hours after the shooting.

The boy was being held at the Montgomery County Juvenile Detention Facility.

KTRK-TV reported that the boys' family was shattered by the death and arrest.

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The family didn’t want to comment, but they said this has been an unspeakable tragedy, the station reported.