Sandy Police Sgt. Jason Nielsen said the shooting took place outside a home around 4 p.m. Tuesday.
Kyler Brink, 13, and his family live less than 50 yards from the scene of the shooting, their back deck offering a bird's eye view of a crime scene Tuesday night.
Prior to the shooting, a female Good Samaritan stopped to give a Rackley and her two sons a ride out of the area. An unidentified woman was driving the auto in which the victims' were found. Police say she picked up the woman and two juveniles in a vehicle acting as a "good Samaritan".
It was unclear if any children still at the school witnessed the shooting or heard gunshots, Canyons School District spokesman Jeff Haney said. He was found dead along with the woman and boy.
Two other children, a boy and girl, were injured in the shooting.
The shooter died in the incident, Salt Lake City television station KSL reported, citing police.
Residents in the neighborhood reported hearing around eight gunshots.
Nielsen is not sure whether the shooter killed himself or if someone else murdered him.
The suspect was found dead at the scene but police have not said how he died.
Police say a man rammed the auto, then started shooting.
The Associated Press is not naming her to avoid identifying the child.
The shooting took place around 20 miles southeast of Salt Lake City, half a mile away from an elementary school.
But there was a significant police presence and a sign fashioned out of blue and red plastic cups on the school's outside fence offering love for the boy in critical condition.
Grief spread through Brookwood Elementary School on Wednesday as the victims of a violent shooting attack nearby were identified as a kindergarten student and his mother, while his brother, a fifth grader, and another student were wounded.
Rackley's husband is doing as well as can be expected for someone dealing with the loss of the mother of his children as well as his youngest child, with another son fighting for his life, said White, who has been a family friend for 30 years.
"It breaks my heart", Linsenmeyer said. Police do not know if the shooter is among the injured or dead but Nielsen says police don't think the shooter is at large.
Colby Corbett, a resident of the same neighborhood where the incident happened, was standing in his backyard waiting for his son, 8, to come from school. "I was panicking bad", Corbett said. Corbett said he was relieved when his son arrived soon after, coming from the school and in the opposite direction of the gunfire.
Trump said he would negotiate to possibly re-enter the agreement, which most of the world has already ratified, on new terms. It may further suspicion at the White House that many career diplomats oppose Trump's agenda or are working to subvert it.
The 45-year-old was crossing the bridge with his girlfriend Christine Delcros on Saturday night when he was possibly run down. Witness accounts suggest that it is possible that Xavier was struck by the van and thrown into the River Thames.
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Prime Minister Theresa May , the Conservative Party leader, was asked earlier on Monday about Trump's criticism of Khan . In fact, Khan was referring in his televised remarks to the presence of armed officers on the capital's streets.
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That was after he failed to disclose a conversation with Russia's ambassador to the United States during his confirmation hearing. But sources say the frustration runs both ways, prompting the resignation offer Sessions.
Mr Trump has since tweeted that Mr Khan had to "think fast" and was making a "pathetic exuse" with his explanation. He said there was still "great sorrow and anger" across the city about the "barbaric " and "cowardly" attack.
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Gaps in police monitoring have been a focus after it became known another attacker in the incident was on a watch list. Ms Delcros was seriously injured by the van, although her condition in hospital has stabilised, her family said.
Arsenal bring Bosnian defender in on free transfer
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