ALEXANDRIA, Ind. – For the second time in less than a month, several police units responded to Alexandria-Monroe Jr./Sr. High School.

According to the Madison County Sheriff’s Department, the move was in response to a threat. There was no evidence of a shooter inside the building, the department said. The building was placed on lockdown as a precaution.

“The school is on lockdown as police check the school as a precautionary effort,” wrote Sgt. Scott Keegan with Indiana State Police on Twitter. “As of right now, there are no injuries or ongoing threat.”

Keegan said the school would resume normal operations once “police have finished their safety check.”

The school district said the threat turned out to be unfounded. After consulting with police, administrators decided students will remain in the building for the rest of the day.

Here’s the district’s full statement:

Today around 11:40 AM the high school was placed on hard lock down due to a threat that was called into police dispatch. The high school staff acted swiftly and police arrived on the scene quickly. At this time, the police believe this threat is similar to the April 17 phone call that was investigated and determined to be unfounded.

The police have determined that there is no threat. After consultation with the police department, it was determined that students will remain in the building for the rest of the day. Thank you for your patience and cooperation.

Alexandria Community School Corporation

Both police and administrators said the situation was reminiscent of an incident from weeks ago.

On April 17, several law enforcement agencies arrived at the school after dispatchers received a call from a person posing as a school employee, according to Indiana State Police. The caller implied there was an active threat inside the school.

The school went on lockdown while law enforcement officers swept the building and secured it. Responding officers said there was no active threat and no students were injured.

Police evacuated the building; students were taken to a nearby church as a precaution during the April 17 incident.