GENEVA — St. Peter Catholic School was evacuated Monday afternoon, after police investigators were called to the school twice for suspicious incidents.

According to Geneva Police Cmdr. Julie Nash, at 1:46 p.m. Monday a man walked up to St. Peter School at 1881 Kaneville Road and told someone at the school that the building was going to blow up if everyone did not evacuate. Students and staff were then evacuated from the building to a nearby safe location. All the students were eventually reconnected with their parents.

Police described the suspect as a white man about 40 years old, with short brown hair, blue eyes and a medium build. The man appeared to have not shaved for a few days. According to police, he was seen driving a white minivan with tinted windows.

St. Peter School serves a little more than 500 students from preschool to eighth grade.

The Kane County sheriff’s bomb squad checked both the school and the church, but did not find anything dangerous or suspicious.

Police could not say whether the bomb threat was connected to another suspicious incident at the school earlier that day.

St. Peter School had been on lockdown Monday morning after police found an envelope with a suspicious substance in an office that had been vandalized.

At 9:56 a.m., police were called to the school for an office window that had been broken. While officers were at the scene, they were advised that a staff member had found a suspicious envelope near where the window had been broken. Officers found an unknown substance inside the envelope and the school was put on lockdown while the substance was tested.

With help from the Aurora Fire Department, police were able to determine the substance was a non-threatening household product, although police could not say precisely what it was.

By 1 p.m., the school had returned to a normal schedule and police had returned to the station, only to be called out again for the bomb threat.

No one has been charged in either incident.

No one at the school was available for comment Monday evening. Nash said extra patrol cars will be stationed near the school Tuesday morning.