OREM, Utah – One student stayed at home for two days after witnessing the assassination of Charlie Kirk, feeling anxious about returning to the Utah college campus where the conservative activist was shot. Another called her father to take her home due to sleeplessness and the haunting memories of what she had seen and heard.

Investigators spent the weekend delving into suspect Tyler James Robinson in preparation for his initial court appearance on Tuesday, while students at Utah Valley University who witnessed Wednesday’s shooting grapple with trauma, grief, and the dark cloud the event has cast over their community.

Although Robinson’s arrest on Thursday night alleviated some fears, many questions remain about the alleged shooter’s motives and planning, as well as the security gaps that allowed a man with a rifle to shoot Kirk from a rooftop and then escape.

The university has said there will be increased security when classes resume on Sept. 17.

In Robinson’s hometown, approximately 240 miles (390 kilometers) southwest of the campus, the law enforcement presence noticeably decreased on Saturday after the FBI executed a search warrant at his family’s residence. Authorities appeared to have towed away a gray Dodge Challenger linked to Robinson, which he reportedly drove to UVU.

No one answered the door Saturday at his family’s home in Washington, Utah, and blinds were drawn on all the windows.

Elsewhere, Kirk’s death has had repercussions for those critical of his rhetoric or unsympathetic towards his supporters. On Friday, Office Depot announced it had terminated an employee at a Michigan store who was recorded on video refusing to print flyers for a Kirk vigil and dismissing them as “propaganda.”

At an impromptu memorial near Utah Valley University’s main entrance in Orem, people have been leaving flowers in honor of Kirk. On Saturday morning, cars circled the nearby streets, honking horns, and displaying American flags and messages like “We love you Charlie,” “Charlie 4 Ever,” and “RIP Charlie.”

In the area where the Turning Point USA co-founder was shot, a crew has begun taking down tents and banners and scrubbing away reminders of the killing.

A memorial to Kirk brings stunned students together

Student Alec Vera stopped at the memorial after finally leaving his house Friday night for a drive to clear his head. Vera said he had been in a daze, unable to concentrate and avoiding people, since watching Kirk collapse about 30 or 40 feet (9 to 12 meters) in front of him.

“I just kind of felt the need to come here, to be with everyone, either to comfort or to be comforted, just to kind of surround myself with those that are also mourning,” Vera said.

One woman knelt, sobbing inconsolably. Others stood quietly or spoke softly with friends. On the outer perimeter of the campus, trees were wrapped in red ribbons.

A handful of cars remained stranded in parking lots by students who left behind keys while fleeing the shooting. One student pleaded with an officer to let him retrieve his bike from beyond the police tape and cracked a smile as the officer let him through. The university said people can pick up their belongings early next week.

Anxious about returning to campus

Student Marjorie Holt started crying when she brought flowers to campus Thursday night, prompting her to change her mind about returning to campus this weekend.

Hours after the shooting, the 18-year-old said she lay in bed, haunted by the horror she witnessed: the sound of a single gunshot as Kirk answered a question and then, “I saw him fall over, I saw the blood, but for some reason it couldn’t click to me what happened.”

After she learned he had died, she burst into tears. Unable to sleep because of a pounding headache, nausea and the day’s trauma, she called her dad, who brought her home to Salt Lake City, about 40 miles (65 kilometers) to the north.

Returning to campus, Holt said, is “going to feel like a terrible, like a burden on my heart.”

Vera said Kirk was shot in the main campus gathering spot — where students take naps, meditate, do homework and hang out.

“Seeing it when I go back, I will be pretty uncomfortable at first, knowing I have to walk past it each time, knowing what had just occurred here,” Vera said.

Struggling with flashbacks and a weird heaviness

Student Alexis Narciso said he has flashbacks every time he hears a bang, a honking horn or other loud noises. He was about 10 feet (3 meters) away.

“I just feel numb. I don’t feel anything,” Narciso said. “I want to cry but at the same time I don’t.”

Jessa Packard, a single mother of two who lives near the campus, said even with a suspect in custody, her feeling of unease hasn’t lifted. Packard’s home security system captured video of the Dodge Challenger that police say Robinson drove to campus. After the shooting, she said, law enforcement officers descended on her neighborhood, searching yards and taking security footage.

“There’s this really weird heaviness and I think, honestly, a lot of fear for me personally that hasn’t gone away,” Packard said. “The fact that there was like this murderer in my neighborhood, not knowing where he is but knowing he’s been through there, coursing things out, is a really eerie feeling.”

Searching for closure from one campus to another

Halle Hanchett, 19, a student at nearby Brigham Young University, said she had just pulled her phone out to start filming Kirk when she heard the gunshot followed by a collective gasp. Hanchett said she saw blood, Kirk’s security team jump forward and horror on the faces around her. She dropped to the ground in the fetal position, wondering: “What is going on? Am I going to die?”

On Friday, she brought flowers and quietly gazed at the area where the kickoff to Kirk’s “American Comeback Tour” had ended in violence.

“The last few days I’ve just, haven’t really said much, I just kinda like zone out, stare off,” Hanchett said, standing with her fiancé as water fountains bubbled nearby. “The memory, it just replays.”

She’s praying for the strength to move forward, she said, “and take it as: ‘OK, I was here for this. How can I learn from this? And how can I help other people learn from this?’”

A neighbor of Robinson’s looks for answers

In Robinson’s hometown, neighbor Kris Schwiermann recalled him as a shy, studious and “very respectful” student who loved to read. Schwiermann, 66, was head custodian at the elementary school that Robinson and his siblings attended.

She said she was stunned by the news of his arrest, describing the Robinsons as a “very tight-knit family.”

Like the Robinsons, Schwiermann is a member of The Church of Jesus Christ of Latter-day Saints. She said they belonged to the same congregation, though she said the family hadn’t been active in the church in at least eight years.

“I want to make sure that people know that we don’t have any ill feelings towards their family or him,” Schwiermann said. “He made the wrong choice.”

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Yamat reported from Washington, Utah, and St. George, Utah. Associated Press reporters Sejal Govindarao in Phoenix and Michael R. Sisak in New York also contributed to this report.