Police noted in a news release that "it is not believed that weapons were ever actually on school grounds", but the student's mother voluntarily surrendered three firearms from the family home in Hartford.
"We took the threat very seriously and moved quickly to fully investigate", school officials said.
Students at Western Branch High School will see increased security and police presence at their building when they return to school Tuesday following a threat.
As FOX13 discovered police are also being added to Corinth schools following a would be threat there. 17-year-old Ryan Robert Debruyne of Green Oak Township was arraigned shortly before 5pm in front of Magistrate Andra Richardson in 52-1 District Court in Novi on a charge of making a false report or threat of terrorism, which carries a maximum penalty of 20 years in prison.
According to a statement, the 15-year-old mentioned shooting a particular student "and Mexicans".
Arlington Police Chief Will Johnson, in a statement on his Twitter account, said, "These threats must stop!"
"This is a courtesy call to notify you that we have investigated rumors of a potential threat to our campus".
They've recommended charges of disorderly conduct against the student. The school resource officer assigned to the high school was contacted immediately and began an investigation. The school district enrolls more than 8,300 students in Oakland County.
Detectives say the student who made the threat has been identified and determined to be unable to carry out the threat. For example, three Molotov cocktails were found in the locker of a student at CA Frost school in MI.
Due to the active investigation, the Central York High School vs. Dallastown District Playoff Basketball Game previously scheduled for Tuesday evening will be postponed.
For example, some 4,000 students were released from school in Nutley, New Jersey, after someone posted a video threatening gun violence towards the school. They did not find a weapon on the girl.
"We will be linking those with the Sheriff's Office and the 911 Center", said Blankenship.
Even though both threats were found not to be credible, both were charged with second-degree felonies for making the threats.
Officers found a note that said, "shoot up school", and "school shoot animae dead", along with a list of names of students.
A social media threat was also made against North Laurel Middle School in Laurel County, according to Kentucky State Police.
In Estill County, rumors spread of threats against the school system on social media.