PITTSBURGH (KDKA) – Three Pittsburgh Public Schools were back on a modified lockdown Monday.

A threat was phoned in against West Liberty Elementary, South Brook Middle School and Pioneer Education Center.

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City and school police were doing extra patrols as a precaution.

“We have issued additional resources to make sure no harm comes to the students and employees at the school complex,” Pittsburgh Police Chief Cameron McLay said in a statement. “We are convinced the caller is using a technique known as spoofing to throw off investigators. Rest assured that the person or persons responsible will be found and will be held accountable for these actions.”

Threats were also made against the same schools last week.

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On Wednesday, a voicemail threat was discovered at Pittsburgh West Liberty shortly before the start of school.

As a result, about 300 students from Pittsburgh West Liberty and 500 students from Pittsburgh South Brook were evacuated to Pittsburgh Brashear High School.

On, Tuesday, a man called 911 and threatened a sniper attack, which prompted another lockdown.

Both Pittsburgh Police and federal investigators are involved in the case trying to track down a suspect.

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