Third threat within three days against Kellenberg Memorial High School in Uniondale

Kellenberg Memorial High School in Uniondale received an anonymous threat for the third time in three days on Thursday, in what authorities described as a series of false swatting calls.

The latest threat was reported shortly before 2 p.m. Thursday when Nassau County police notified high school officials of a threat during eighth period, Kellenberg's principal, Brother Kenneth Hoagland, said in a message to parents.

The latest threat was similar in nature to threats made on Tuesday and Wednesday mornings before classes began. Each threat was sent via text message through a suicide hotline. One of the threats against the school referred to bombs and armed intruders in the school. In each case, police searched the school and determined the threat was unfounded.

“Please know that we are working with Nassau County Police to determine the actual source of these threats,” Hoagland said. “What we do know is that they all have a similar style and are attempting to disrupt normal operations.”

Police said a similar threat was made against another school on Wednesday. Officials did not name other schools involved. At least one of the threats originated in Oregon, officials said.

Thursday's threats referred to “dangers inside and outside the building.” Police asked students and teachers to stay in classrooms while police searched the school, Hoagland said.

Police, along with school administrators, searched all classrooms, restrooms and hallways, and students were informed through announcements that police officers would be checking classrooms to ensure their safety, Hoagland said.

The pattern of swatting calls “is intended to incite unrest and cause chaos,” Hoagland said. School officials said they take every threat seriously.

“Safety is our top priority, but we are also responsible for your child's education. Every decision we have to make is in the best interests of your child,” Hoagland said.

Several parents said Thursday that the threats were concerning and had caused undue fear among both parents and students.

The school plans to livestream Friday's opening “Triumph of the Cross” service in its chapel for students to watch in their classrooms, where they will remain until classes resume. No outside visitors will be allowed on campus on Friday, officials said.

Due to a rally by former President Donald Trump planned for the evening at the Nassau Coliseum, Kellenberg is also canceling events for Wednesday and limiting classes to remote learning.

School officials urged parents to monitor their children's phones and social media.

“Our administration and staff are working diligently to ensure your child's safety,” Hoagland said. “Unfortunately, some students are taking the situation lightly by sharing things on their social media that cause unnecessary fear and anxiety.”

John Asbury is a breaking news and general assignment reporter. He joined Newsday in 2014 and previously worked at The Press-Enterprise in Riverside, California.