The teenager who allegedly gunned down three classmates and injured eight others took his father's gun with him to his Michigan high school, officials said.
The suspected gunman, a 15-year-old boy, was taken into custody after the Tuesday afternoon shooting at Oxford High School in Oxford Township. The semiautomatic handgun, a 9mm Sig Sauer pistol, was confiscated, officials said.
MORE: Michigan school shooting: What we know about the victims
Three students ages 14 to 17 were killed and eight others, including a teacher, were injured.
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People attending a vigil embrace at LakePoint Community Church in Oxford, Mich., Nov. 30, 2021, after a student opened fire at Oxford High School, killing three students and wounding several others, including a teacher.
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Parents walk away with their kids from the Meijer's parking lot in Oxford where many students gathered following an active shooter situation at Oxford High School in Oxford, Mich., Nov. 30, 2021.
The suspect's father purchased the weapon on Black Friday and officials are looking into how the family stored its guns and how much access the teen had to them, according to a source briefed on the investigation. The suspect had apparently used the gun prior to the school shooting, the source said.
Detectives are also examining the suspect's writings and devices, the source said.
MORE: 3 killed, 8 hurt in shooting at Michigan high school
It has not yet been announced if the 15-year-old will be charged as an adult.
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Students, parents, teachers, and community members gather for a vigil at the Lake Point Community Church following a shooting at Oxford High School on Nov. 30, 2021 in Oxford, Mich.
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Flowers are placed on a sign outside Oxford High School a day after a deadly shooting at the school on Dec. 1, 2021 in Oxford, Mich.
Out of the eight injured, three were in critical condition Tuesday night: a 15-year-old boy shot in the head; a 14-year-old girl shot in the chest; and a 17-year-old girl shot in the chest, Oakland County Sheriff Mike Bouchard said.
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Students, parents, teachers, and community members gather for a vigil at the Lake Point Community Church following a shooting at Oxford High School on Nov. 30, 2021 in Oxford, Mich.
A 14-year-old boy was in serious condition with jaw and head wounds.
Three students were in stable condition: two 17-year-old girls and a 15-year-old boy. The teacher, a 47-year-old woman, was treated and released from the hospital with a graze wound to the shoulder, Bouchard said.