PHILADELPHIA (CBS) - A high school in Southwest Philadelphia was placed on lockdown following a shooting threat. Philadelphia police say Bartram High School was placed on lockdown after a student notified the school of a shooting threat posted on Instagram.

Authorities say the post was of a male holding a rifle with the caption, "gonna shoot up the school at 11:00 am."

School security put the school on lockdown at 10:10 a.m. Friday. 

School officials say the lockdown was lifted and they are now under a lock-in, meaning students can move from class to class but cannot leave the building or re-enter.

Attendance is being taken and each room is being checked.

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