Pleasant Grove High School in Utah County was on lockdown for several hours Thursday afternoon following a false report of a person with a gun.
The lockdown was lifted at about 4:15 p.m., according to Pleasant Grove police, and all students were being released.
Kimberly Bird, an Alpine School District spokeswoman, said no weapon was found and the report was later retracted by the person who made it.
KUTV reported that police confirmed a student who claimed he saw a man in a trench coat with a gun made up the story.
Officers had cleared the school room-by-room, with students escorted out by officers, police said.
By 4:30 p.m., buses were picking up students at 400 E. 200 South in an LDS Church parking lot.
Meanwhile, police said they had set up a staging area in the parking lot of the Rec Center where parents of students could wait.
David Stephenson, an Alpine School District spokesman, had earlier said that police received a message that there was a possibility that a student had a weapon but the report was unconfirmed.
Stephenson said students were being taken to the gymnasium after their classrooms were searched. No weapon had been found as of 3:20 p.m.
Parents of the 2,130 students at the school were notified by email and phone of the lockdown and will be told when it has been lifted, Stephenson said.