One of My Scariest Days- Bomb Threat

On Wednesday morning, I got a call from my daughters school saying there was a bomb threat, the school is on lockdown and to wait for further instructions!!!

WHATTTTTT!   I froze!  I got sick!  I have 2 girls and they are in separate schools, so I got in my car & drove to see which school it was, and saw that it was the high school.  I text my daughter and called, no answer. I drove back home, waited, but no phone calls, and went back to drive by the school.  Now it was worse the bomb squad arrived. There was police, fire, paramedics, news, helicopters.  My life went into slow motion. I started crying, all I could think of was Columbine!

We were instructed to go the strip mall and wait for a briefing.  We were told our kids would be escorted to meet us.  It was the strangest scene. There were tons of parents lined up and time just stood still in silence.  Finally after 2 hours, my daughter called, told me she is on her way to meet me, and asked what should she do if something happened.  I told her to run if she hears shots if she can, hide or just get down.
How do you tell your kid that? What do you say when there is a potential bomb or maybe a shooter?

The day before, on Tuesday, a boy threatened a group of kids that they will meet God tomorrow.  These kids told a teacher and the next morning he was called in to the principals office.  When they asked to talk to him, he ran and was cornered in the library. Guess who was just evacuated from there, my daughter.  In his bag he had what looked like 2 grenades & a bomb.

He was arrested and taken away, but the stories that unfolded afterwards were even more frightening:
1. Students told stories of being threatened by him.  He told them he was going to cut their throat because they were jewish.
2. He said he felt connected to Hitler and his cause.
3. He wrote movies and plays for school about blowing the school up.
4. He came to school some days as the joker from Batman or dressed in Military uniforms.
5. He has movies on Youtube about shooting & war & blowing things up.
6. He told students he was bringing a ak 47 to school.
7. He was arrested for a possible terrorist act.
8. Was suspended for threatening to do something 2 weeks ago.
and on and on...

Now how the Hell was this kid allowed to walk the halls of school?

How could the schools let these kids, who publicly express crime, hate and murder be allowed at school?
Our school has a no tolerance bullying act, WHATTT, but we let people who could be potential murders in!
Why didn't they listen to all the complaints others made about him?
Do you know when they say there were no signs, or they missed the signs?  I think they didn't want to do anything about what they knew!!  I know he has problems, and I'm sorry for his family, but I need to protect mine.  I don't know of anyone in the real world that could say these things and it be normal.

How do we protect our children?  What do you say for them to do if someone starts shooting?  We teach them about fires, earthquakes, strangers.  What should I tell my girls because it seems that our school thinks it's OK for these people to walk along with my kids?

You don't think it's going to be you, but it was....