It happened at the Philly First Charter School in the 4300 block of Tacony.
According to police, staffers received a call from a woman who reportedly threatened to shoot up the school around 9:45 a.m.
The school was placed on lockdown and police were called. The lockdown was lifted about an hour later.
There has been no report of any injuries.
Stay with Action News and 6abc.com as this story develops.
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