The routine at Salk Middle School was barely affected by a potential shooting threat posted on social media earlier this week, Principal Peter Elzey said Friday morning.

“It’s good, and we’re running school normally,” said Elzey, who was preparing for visits from fifth- and sixth-graders later in the day.

However, the northwest Spokane school has an additional resource officer on duty “to make sure that everyone feels secure,” said Elzey, who added attendance was “close to normal” Friday.

The threat surfaced Wednesday on Snapchat. A post was sent to a Salk student and included threats to “shoot up” and “kill” others in the school.

While the district and law enforcement quickly determined the threat was not credible, Salk administrators responded Thursday with a voicemail to parents.

The threat is still under investigation, said Kevin Morrison, the director of community relations and communications for Spokane Public Schools.

“We take all threats seriously,” Morrison said.

Spokane police officials did not respond to inquiries asking whether a suspect has been identified.