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Unified Police officers rushed to Hillcrest High School in Midvale late Wednesday morning on a report of a gunman on campus, but within a hour they had cleared the high school and lifted a lockdown.

UPD Detective Ken Hansen said that the school was put on lockdown about 10:10 a.m., as officers cordoned off the campus at 7350 S. 900 East. A subsequent sweep of the high school and its classrooms turned up no evidence that the report was legitimate.

Salt Lake County Sheriff Jim Winder said the calls — the first reporting a gunman barricaded inside the school, then a second claiming gunshots had been fired — were a horrible hoax.

"We had a strong indication it was false," said the sheriff, adding that it was decided to respond with "an abundance of caution" in ordering the lockdown.

Winder said he is determined that the hoaxer will be found and held to account.

The caller claimed to be conveying "second-hand" information, and claimed that gunshots may have been fired in "Hall 400." There is no Hall 400 at the school, police soon determined.

At UPD's request, Canyons School District officials also issued precautionary "shelter in place" orders to nearby Midvale Middle School and Midvale, East Midvale, Midvalley, Jordan Valley and Crescent elementaries. All lockdowns and shelter-in-place orders were lifted by 11:20 a.m., the school disctrict said.

Juan Diego Catholic High School in Draper also was locked down, by order of Draper police, while the Hillcrest High School episode was being investigated.

Twitter: @remims