The Eastern Kentucky University Police Department is investigating a report of graffiti with threatening language found in a campus building Sunday, October 4, according to an EKU release.

Schools in Norman, Oklahoma and Richmond, Kentucky are on alert this week after threats of violence were found scrawled on bathroom walls. 

While no incidents have occurred, the threats come on the heels of a deadly shooting at Umpqua Community College in Oregon that left nine victims dead. 

In Kentucky, classes at Eastern Kentucky University were canceled through the end of the week so that law enforcement officials could investigate a threat left on a bathroom wall in a building on campus. The graffiti, discovered Monday, read “KILL ALL BY 10/8/15 THIS BU OOP.” The university was offering a $10,000 reward for information leading to the arrest and conviction of those responsible for the threat.

A spokeswoman for the FBI field office in Louisville confirmed that the office had been notified of the threat and was working with local police on the investigation, but declined to provide further details.

In Oklahoma, shooting threats on consecutive days at Norman North High School prompted police investigations and led parents to pull their children out of school. On Tuesday, a threat — which officials labeled a “copycat” message — was found written on a stall in a men’s bathroom. Norman Public Schools Superintendent Dr. Joseph Siano, in a letter to parents Tuesday, said authorities believed the threat may have been an effort to disrupt classes. “We are not surprised by the message, as copycat messages are typical,” he wrote. “Both messages will be included in the ongoing investigation.”

On Wednesday, a spokeswoman for the Norman Police Department said several leads were being followed and, although Norman North is closed for the remainder of the week for fall break, the safety of students upon their return would remain of utmost priority.

“We will take every threat seriously,” said Sarah Jensen, public safety information officer for the Norman Police Deparment. “We have no holdbacks on sending as many officers (to the school) as we can — without compromising safety in other parts of the city.

“We try to have as many as we can on the ground.”

A spokesperson for the Oklahoma State Bureau of Investigation said their office had not been contacted in connection with the investigation. Jensen added that decisions to bring other agencies in on investigations like the ongoing one are made in concert with school safety officials.

“Most of our determination starts with the schools,” she said. “If they notify us about the extent of (an incident), we usually determine the resources from there. We do have that conversation.”

Similar incidents have been reported around the country in the last week.

Authorities in New Jersey are also investigating a bomb threat written on the wall of a West Milford High School boys bathroom last Friday.

Two students in Lafayette, Indiana were arrested after their threats, also written on a bathroom wall, claimed a shooting was planned for last Tuesday.