Campus police later received calls reporting shots fired.
Police say they have ended a search of rugged foothills without finding a man suspected of killing a University of Utah student in a carjacking attempt.
Brophy says authorities believe the couple have been in Utah for several days and were camping in the foothills above the University of Utah.
Shortly after 9 p.m. Boutain allegedly shot Guo in the head.
In a statement, University President David W. Pershing stated that Guo was a pre-computer science major who worked as a peer advisor in the International Student and Scholar Services Office. She is now in custody in Utah.
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Police sniper teams and armoured cars converged on a canyon near the University of Utah's Salt Lake City campus on Tuesday to search for a gunman who killed a student and is suspected in another homicide in Colorado.
Brandon Shearer said officers weren't immediately releasing the victim's gender or other details.
Classes were cancelled on Tuesday at the university, where officials remembered Guo as "extraordinarily outgoing, creative, smart and extremely engaged".
School officials sent out an alert telling students to stay inside and that all dorms are on lockdown. SWAT teams searched the canyon area through Tuesday morning, with snipers watching to make sure Boutain, believed to be armed and unsafe, did not threaten officials. A helicopter was assisting the search.
Salt Lake City police asked the Golden Police Department to do a welfare check at a trailer at the Clear Creek RV Park in central Golden after a green 2000 Ford pickup truck registered to a man living there was linked to the shooting.
Traffic is blocked off near the area, and Utah Transit Authority trains are not proceeding east of the stadium station at the west side of campus.