Are plans in place if schools attacked?

It's about 8:42 in the morning, and you have just sat down at your desk with a cup of hot coffee. As the sheriff of this small rural community, you are reviewing the overnight reports from your graveyard shift deputies. It was, as usual, a relatively uneventful night. Unbeknownst to you as you read your reports, only about five minutes before, a nondescript car with tinted windows along with two minivans just rolled into the parking lot of your local county elementary school. They stop near the school's main office, parking along the curb. The doors suddenly fly open and out rush teams of hooded, armed men. They are carrying military load-bearing equipment, handguns, canteens, small backpacks and have rifles, M-16s and AK-47s. They rush to the doors, and immediately two of the men move directly to the front office. The men charge inward, a team of three others follows behind, and two more are hand-carrying a large kit bag between them. The hooded intruders begin to fan out through the school, several rushing down the halls toward the side door exits. The secretary at the front desk jumps up with her mouth open, ready to scream, but she is slammed to the floor as the two men with weapons pointing shout for all to move away from their desks. One of the men grasps the microphone for school announcements. The other man rounds up those in the office - the vice principal, a student - and orders them to sit down on their hands; another hooded man comes in and begins to quick cuff them. The team with the kit bag moves to the auditorium shouting for the workers to move from the kitchen inside the room. A teacher in the hallway upon seeing armed men running toward her begins to scream, some doors open as teachers peer out. Systematically, armed men enter classrooms screaming orders while blasting air horns for the children to move to the lunchroom. It's chaos at one end of school. Rapidly, students and teachers are herded to the auditorium that doubles as the lunchroom...

Are plans in place if schools attacked?