SAN MARCOS, Texas (KXAN) — A stack of flyers with “unsubstantiated threats of possible explosions” were found in a Texas State University building Tuesday morning, according to Texas State Police.

“The threat identified four locations on campus: Jowers, Theater, Chemistry and Education buildings. Since this morning, we’ve been diligently checking all of our facilities,” said Texas State University Police Chief Matthew Carmichael.

Texas State University student Meagan Garza said it was just like any other chemistry class until they got a message from the university about the threat.

“We saw the dogs like with the cops patrolling around sniffing,” Garza said.

Carmichael said they found no credible threat to campus but still will be on alert for the rest of this week.

“There will be an increased police presence on campus as the situation is being investigated,” Carmichael said.

Police said they swept the buildings and outlying areas.

The buildings were not evacuated and university activities continued as scheduled.

University police said it is collaborating with the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), UT Austin Police, Homeland Security and the FBI.