(PUEBLO WEST, Colo.) — On Easter day, April 20, a message containing threats to students and teachers of Pueblo County School District 70 (D70) was allegedly sent to people, prompting several school closures for Monday, April 21, as the Pueblo County Sheriff’s Office (PCSO) investigates.

A viewer provided FOX21 News with a message sent to parents from D70 stating that, out of an abundance of caution, Liberty Point International School, District 70 Online Learning Academy Pueblo West Campus, and Swallows Charter Academy would be closed on Monday while the investigation continues.

D70 sent a statement, saying, “Pueblo County School District 70 is working in close partnership with the Pueblo County Sheriff’s Office to investigate the situation.”

According to PCSO, the Sheriff’s Office received information of a possible threat, which at this time doesn’t appear to be a credible threat. PCSO stated, “We are working with District 70 officials and continue to investigate. We will have an increased presence at the schools tomorrow.”

The threats were sent 26 years to the day after the Columbine shooting, when two teenage boys took the lives of 12 students and one teacher.