Washington High School beefed up security and barred visitors last week after a small group of demonstrators assembled near the school located just west of downtown Atlanta.

School officials reported that members of the group carried signs referencing the end times and urging people to repent, said Atlanta Public Schools spokeswoman Pat St. Claire.

There were fewer than 10 participants in the demonstration, which she said took place Thursday afternoon during school dismissal. The demonstrators gathered near the school but not on district property, she said.

She said the group’s purpose was difficult for high school administrators to discern, and the district doesn’t know if they represented a specific organization.

In response, the district’s police department enhanced security measures. No visitors were allowed into or out of the building.

“Their immediate goal was to keep the kids safe that was the reason for the soft lockdown,” St. Claire said.

The demonstrators have not returned to the school, according to reports she has received.