SIOUX FALLS S.D. (KELO) — At 1:30 p.m. MT, all schools were lifted off “secure status,” according to a post by the Pennington County Sheriff’s Office.

1:33 p.m. CT:

All Rapid City Area schools are under a secure status, according to an email sent to parents by the school district.

“A threat was made to a west side school around 11 a.m.” the email said. “The safety of all students district-wide is a top priority.”

On social media, the Pennington County Sheriff’s Office said there was a “report of a social media message circulating among students depicting a firearm.”

Authorities said no students have been harmed and other Rapid City Area School schools are on secure status.

“There is currently a large law enforcement presence in and around Stevens High School as we work through determining the validity of a generalized threat and the identity of the individuals responsible,” the Pennington County Sheriff’s Office said.

The secure status is out of an abundance of caution, according to the district.

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The email says all students and staff are safe at this time.

This is a developing story.