SQUIRREL HILL — The Colfax Elementary school in Squirrel Hill is on lockdown, a district representative confirmed to RMU Sentry Media.

The district said in a phone call that the lockdown was due to a threat against the school. A tweet from Pittsburgh Public Safety confirmed the incident via Twitter. In a later tweet the department said that the threat was received via phone call.

Pittsburgh Colfax is on lockdown after an anonymous caller said a firearm in school. No weapons found but PPS police and @PghPolice are searching room to room. No proof callmis credible, but we are taking every precaution necessary. More info will be released when we have it.

— Pgh Public Safety (@PghPublicSafety) October 31, 2018

Allegheny County Controller Chelsa Wagner was volunteering inside of a fourth-grade classroom when the lockdown went into effect.

On Saturday, police say that 46-year-old Robert Bowers shot and killed 11 people and injured six more at the Tree of Life Synagogue in Squirrel Hill.

Superintendent of Pittsburgh Public Schools Dr. Anthony Hamlet released a statement on Sunday following the shooting.

“This is Superintendent Hamlet. It is with a heavy heart that I call you this evening,” said Hamlet. “The third of three acts of hate that took place in the U.S. this week occurred right here in Pittsburgh. As a school community, as a Pittsburgh community, our hearts are broken as we try to understand this terrible, painful tragedy that occurred in Squirrel Hill.”

At 11:25 a.m., Pittsburgh Public Safety confirmed that the lockdown has been lifted and no weapons have been found.

UPDATE: Building is clear. No weapons found, all kids are safe. Source of phone call will be investigated.

— Pgh Public Safety (@PghPublicSafety) October 31, 2018

The elementary school is under a mile away from the synagogue where the shooting occurred.

This story is developing, stay with RMU Sentry Media for more details.