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PHILADELPHIA (CBS) - A school in North Philadelphia was placed on lockdown Thursday after someone reported that a student on campus had a gun, school officials say.

The report prompted the lockdown of Tanner Duckrey School, located at 1501 Diamond Street, just before 10 a.m.

Police searched the school and found a BB gun in a student's backpack. That student was taken into custody and the lockdown was lifted.

However, police say that was not the person who had been reported with possibly having a gun at the school.

Authorities say around 11:45 a.m., two young males were stopped nearby in reference to the lockdown. They were both taken into custody.

The incident remains under investigation.