Strike Force of New Jersey

Armed guards showed up at a Jersey City school the day after Sept. 11 this year, and parents, security guards and students had no idea who they were. (Credit: CBS 2)

Union: Jersey City School District Ran Secret Security Preparedness Drill

Security Guards at one elementary school in Jersey City said it could have been a tense situation. They told their union that on Sept. 12 a man with a gun tried to get into the school.