Denver Public Schools sent a letter to parents and staff on Monday and Friday regarding social media threats of violence mentioning DPS schools.

Two kids ages, 12 and 15 believed to be responsible for school threats were arrested. A third threat investigation was proven to not be substantial.

School shooting threats continue in states nationwide after the Apalachee High School shooting in Winder, Georgia, on September 4.

Social media threats about mass shootings at several Manatee County Schools resulted in the arrest of a 15-year-old, the sheriff’s office said. The Manatee County Sheriff’s Office and the Bradenton Police Department began investigating the threats on Thursday and located a ninth-grade student they say made threats online.

A high school student accused of threatening to shoot up a school was removed from classes Wednesday while police investigate and seek charges against the teen. On Wednesday, Sept. 11, police were called to Springport High School in northwest Jackson County for a report of a student threatening violence,