UPDATE: Elmwood Park High School Lock Down Lifted After 'Unfamiliar Individual' Seen On Campus

(CBS) -- UPDATE: The lock down at Elmwood Park High School has been lifted.

Earlier ...

Elmwood Park High School has been put on a lock down after an "unfamiliar individual" was spotted in the building, according to school officials.

The Elmwood Park Police Department and River Grove Police Department have responded.

Developing ...