Police say they believe a Cuyahoga Falls teen’s threats on social media to commit a shooting at the high school were credible after authorities found weapons Wednesday in his home.

Allen M. Kenna, 18, faces a felony charge of making terroristic threat and a misdemeanor criminal trespassing charge, according to Stow Municipal Court records. He pleaded not guilty Thursday during his arraignment.

Cuyahoga Falls Police Lt. Gary Merton declined to say what weapons were discovered during a search of Kenna’s home.

Police responded to Cuyahoga Falls High School after hours Monday when a school custodian reported seeing Kenna walking around the building.

In a phone message to district parents Wednesday afternoon, Cuyahoga Falls City School District Superintendent Todd Nichols said his staff "immediately" called police following the incident Monday.

"Monday evening, a suspicious individual was identified in the halls of CFHS who appeared to be taking pictures using a cellphone," said Nichols. "When addressed by CFHS staff, the individual fled the premises."

The district’s surveillance equipment was used to capture photos of the man, and it was determined he was not a student at the school, Nichols said in the call.

Nichols said Thursday that Kenna was home-schooled and never attended Cuyahoga Falls High School, but was known by some of the people at the school.

Nichols said the photos and identification were shared with police Wednesday morning.

Nichols said the school did not receive any threats directly, but alleged threats Kenna made on social media were found during the subsequent police investigation.

A Cuyahoga Falls Police Department news release issued Thursday alleged Kenna "made threats to commit a shooting at the school."

A complaint police filed with the court alleges the threats were made before the trespassing incident.

After the execution of a search warrant at Kenna’s home, he was arrested and taken to Summit County Jail.

Nichols told district families that the incident is a reminder to follow the mantra, "if you see something, say something."

"By doing so, we can help the entire community stay as safe as possible," added Nichols.

Reporter Phil Keren can be reached at 330-541-9421, pkeren@recordpub.com, or on Twitter at @keren_phil.