MIDLAND PARK, N.J. -- Midland Park Jr./Sr. High School was temporarily locked down on Tuesday after someone reported finding a shell casing on school grounds, officials said.
A Bergen County Sheriff's K-9 unit swept the building with negative results, they said.
The lock down was lifted just after 11 a.m.
Schools Supt. Marie Cirasella confirmed the discovery in an email to parents.
Click here to sign up for Daily Voice's free daily emails and news alerts.