That knowledge changes everything and leads to a horrible tragedy.

There's the chance to learn from this horrible tragedy and have a new beginning.

I know it must have been a horrible tragedy for you.

"Maybe some good will come out of this horrible tragedy," he said.

Learn what you can do to educate and prevent this horrible tragedy.

People call it the 'horrible tragedy' or some variation on that.

We were up and running three days after this horrible tragedy.

On 9/11/2001, I wrote my first poem for all those affected by the horrible tragedy.

What a horrible tragedy, and yet he had already seen so much of it.

We cannot begin to comprehend how this horrible tragedy occurred.