A bomb threat prompted the evacuation of a Jefferson County high school Wednesday.

Students and teachers at Northwest High School, in Cedar Hill, were forced onto the school's football field as police were called in to investigate.

Police said Chance Foy of High Ridge, an 18-year-old student, was taken into custody as police bomb dogs from St. Louis City, County and Arnold Police Departments searched the area.

Foy is charged with Second Degree Making a Terrorist Threat, a Class E felony, and is being held on a $50,000 cash-only bond.

Police said two students told administrators they heard another student make a threat, stating, "I have a boom boom." The nature of the threat, which is continuing to be investigated by police, was not made public. Police said they did not view the threat as credible.

Students evacuated at Northwest High School after bomb threat. 18 year old male student in custody. Investigation and search of premises continues with bomb dog.— Sheriff Dave Marshak (@SheriffMarshak) March 21, 2018

No bomb was found and the student claimed he was just joking, but school officials said they weren't taking any chances.

"I think we just wanted to be overly cautious in this case," said superintendent Dr. Desi Kirchhofer. "There was no hard evidence, there was the comment and within the hour we had identified the student. And the student was telling us, Yes, I made a comment, sorry I made a mistake it was a joke."

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