1.   There was no distress signal or mayday call from the Heritage, and coastguards have no idea what caused the tragedy.

2.   Before the sentencing, Ms. Bongiorno delivered a tearful apology from a two-page statement, saying she caused a tragedy for three families, including her own.

3.   Both tragedies were caused by wheels coming off cars during a crash and flying into the stands.

4.   But Zeliff said Sunday that government actions may have caused the tragedy.

5.   For that matter, nobody has figured out whether the TWA tragedy was caused by terrorism or some bizarre freak of fate.

6.   Gas leaks have also caused tragedies in Mexico.

7.   If you do cause a tragedy like this, you will be lucky if it only kills you.

8.   None of us caused the tragedy in Oklahoma City, but all of us contributed to it.

9.   Still, most tragedies are caused not by hate-filled maniacs, but by small, unnoticed failures in complex systems.

10.   The airline, however, said it was too soon to say precisely what happened or what may have caused the tragedy.