Several school districts in Alaska received threats prompting evacuations and…

A 17-year-old boy in Henderson, Nev., was arrested on terroristic…

Emma Hardiman, 18 - via WKOW.com screenshot

Spokane schools and police were put on high alert after…

Hillsborough County, Tampa, Fla., sheriff’s car - via wtsp.com screenshot

A bomb threat was made against Summit High School in…

Brian Jones, 46 - Metro Police Nashville via Nashville.gov screenshot

An online threat disrupted classes at North Middle School and…

A man was arrested for making a shooting threat at…

Police tape blocks entry to Chabot Elementary in Rockridge after…

Livingston Parish Public Schools in Livingston Parish, La., canceled classes…

A 16-year-old student was arrested for making threats toward South…

Three Kentucky teenagers have been charged with terroristic threatening after…

Union Public Schools' Ellen Ochoa Elementary School - via KTUL…

An arrest warrant has been issued and an FBI investigation…

Fernando Gaete, via ABC 25 WPBF News screenshot

King’s Fork Middle School schoolbus, Suffolk, Va. - via 3…

Chippewa Valley High School, Clinton Township, Mich. - Macomb Daily…

Prior Lake High School in Savage, Minn., closed due to…

Joshua Clark, via The Landmark screenshot

Several suspects have been identified in relation to a social…

Destiny Kaduce, 19 - via Globe Gazette screenshot

Sutter Middle School in East Sacramento experienced another reported threat,…

Laguna Hills High School football field - via Google Maps…

A 15-year-old boy from Maple Grove, Minn., was arrested in…

The Salem Police Department arrested a teenager in connection with…

An empty corridor in a Maryland school - Kerem Yucel/Anadolu…

The Museum School of Avondale Estates in DeKalb County, Ga.,…

James Leynse/Corbis via Getty Images

Kenny Raymond Larkins, 20, a former student of Woodhaven High…

Victoria Perkins, a former student of Greenfield-Central High School, in…

Law enforcement officers respond to threat at C Roy Charmichael…

A 16-year-old from Dania Beach, Fla., was arrested for allegedly…

Goochland (Va.) High School - via 6 News Richmond screenshot

A student at Kenmore Middle School in Arlington, Va., is…

Frisco ISD school building, Frisco, Texas - via WFAA screenshot

Emmanuel Christian School in Dothan, Ala., received increased security and…

North Wilkes High School in Wilkes County, N.C. via https://nwhs.wilkescountyschools.org/

A credible threat was made to Throckmorton Collegiate Independent School…

A teen suspect has been arrested in connection to a…

Fox Chapel Middle School, Spring Hill, Fla. via Yahoo Life…

A 13-year-old boy from the Bronx, N.Y., has been charged…

A 15-year-old student from Superior Central Schools in Alger County,…

William Whitworth - DA Office of 18th via Fox News…

Myrtle Beach High School Official Facebook account

Denver East High School Via Facebook official account

A child cries on the bus leaving school following a…

Two adults have been arrested after a social media threat…

Kenneth Cole Candelario, after being arrested for shooting into an…

Photo by River Bluff High School website

Arvin Raj Mathur - St. Clair County Sheriff's Office via…

Photo: ChiccoDodiFC via shutterstock

Miriam Angel-Hernandez, 18, via Hickory Daily Record screenshot

Photo Samantha Laurey/AFP via Getty Images

FILE PHOTO (Weber School District)

Jonathan Raa/NurPhoto via Getty Images

A 15-year-old male student at Potomac High School in Potomac,…

North Mac High School, Sangamon County, Ill., via northmacschools.org screenshot

Amesbury High School

MSU students hug during an active shooter situation on campus…

Tucker County High School, Hambleton, W. Va., via WDTV News…

Tucker County High School, Hambleton, W. Va., via WDTV News…

Anchorage Alaska. Photo: Paxson Woelber - CC-BY-SA-3.0.

the skyline of downtown Knoxville, Tennessee. Nathan Fortner - CC…

A mother in Chelsea, Mass., shows a text she received…

Downtown Main Street, Johnstown, Penn. Photo: Masst1984 Wikipedia CC BY-SA…

A plaque at the entrance of the Sandy Hook Permanent…

CC BY-SA 3.0

KETV 7 News screenshot

By Ben P L - Corner Canyon High School, CC…

Jared Cochran (Woodford County Jail) by 25 News Now

Hilliard Davidson High School electronic bulletin board via 10 WBNS…

Loyalstock Township High School

West Salem High School/Facebook via KGW8 screenshot

Nearly a dozen New Hampshire schools and several in Montana…

Two 11-year-olds were determined to be the source of a…

Urbana High School, Illinois – Syndey Laput via The Daily…

Chandan Khanna/Getty Images

St. Louis police stand outside an entrance of the Central…