A judge has found that a Greenville, Pennsylvania dentist is not currently competent to stand trial on charges filed after he allegedly threatened AT&T store employees with a knife and threatened to bomb the store.

Mercer County Common Pleas Court Judge Ronald Amrhein Jr. has ordered that 61-year-old Duane Gruber undergo involuntary mental health treatment at Torrance State Hospital.

Several charges, including making terroristic threats and harassment, were filed against Gruber following a February 19, 2020, incident at an AT&T store on East State Street in Hermitage.

Store Employees told police Gruber began pacing around the store, then telling employees not to call the police and that he had a knife.

According to police Gruber said he would fight officers and said he would "knife" everyone inside the store.

Employees said they escorted Gruber from the store and locked the door while he threatened to bomb the store.

Gruber was then reported to have been yelling at passing cars while holding a sign.

Police say when they arrested Gruber, he was carrying three knives.

As a result of the incident, the Pennsylvania Bureau of Professional and Occupational Affairs suspended Gruber’s license to practice dentistry last year, declaring that Gruber posed an “immediate and clear danger to the public health or safety”.

It was the second time that Gruber’s dental license was suspended.

In 2017 the state temporarily revoked Gruber’s license to practice dentistry after he was charged with aggravated assault, terroristic threats, recklessly endangering, and disorderly conduct for allegedly pointing a shotgun at police officers.