Denver’s South High School returned to normal operations early Friday afternoon after police located a student who allegedly made a threat and triggered a three-day lockout.

“Denver police have located juvenile they had concerns about,” a Denver Public Schools tweet said. “The school will return to normal operations.”

Denver police began searching Wednesday for a runway teen after the suspect allegedly made threats against South High School.

Police had issued a statewide alert, and had an outstanding warrant for the teen, whose name has not been released because he is a juvenile.

South High School Principal Bobby Thomas wrote in a letter to parents on Thursday night describing the circumstance.

“A South student, who is a minor, allegedly made a threat against our school, and is now a runaway. Our officers have a heightened concern for the safety of our school community, as well for this individual student,” Thomas wrote.

Wednesday morning, the Denver police tweeted that South High was on lockout. Later in the morning, police followed up on Twitter, saying, “At this time, investigators do not believe there is a credible threat to South HS.”