SIOUX FALLS, S.D. (AP) — Security has been increased at Roosevelt High School in Sioux Falls following an email threat that police believe is a hoax.

Police spokesman Sam Clemens says the email which threatened a shooting is similar to other email hoaxes that have been received across the country.

Clemens says extra officers are stationed at Roosevelt Thursday where school started last week. It's the second time the district has heightened security in a week. The first involved a custodian who hid a loaded gun at another campus.