Shelter-in-place at University of Colorado's Norlin Library, lifted elsewhere, after "potential swatting incident"

UPDATE: Late Monday night police on the CU campus declared there was no threat.

The University of Colorado Boulder's campus has lifted a campus-wide shelter-in-place, although a shelter-in-place remains active at Norlin Library after what police are calling a "potential swatting incident."

Police said they responded to a call of shots fired and evacuated the library and Sewell Hall, but hadn't found anyone injured.

The initial alert was sent to the CU community at 4:54 p.m. and said, "Emergency personnel responding. Avoid area."

The university later said around 5:15 p.m. that the shelter-in-place remains in effect for the main campus and the East Campus wasn't impacted.

Just before 5:30 p.m., police said they were investigating a call of shots fired at the library, but had not yet found any injured people or a suspect.

Then at 5:30 p.m., police said they were investigating a "potential swatting incident at Norlin Library. CUPD has cleared Sewell Hall. The shelter in place has been lifted for all locations on main campus except Norlin Library. A heavy police presence remains in the area and will continue while CUPD investigates."

CU's fall semester began last Thursday.

Swatting incidents, where people report fake incidents to police to elicit a response, have been seen at Villanova University, the University of South Carolina, the University of Tennessee, Chattanooga, and the University of Arkansas at Fayetteville.