This was a scary and rare occurrence, not a pattern.

It was such a rare occurrence. People are going to search for a solution to this, but I really don't think anything was wrong. It was a beautiful day; there were the correct number of people on the boat. They were doing everything right according to the regulations.

I do not believe this establishes a pattern and I believe these are rare occurrences -- very, very tragic and unfortunate occurrences.

The roads are filled with armed robbers, and murders for mere plunder are of daily occurrence.

It's not a very frequent occurrence.

This is not common at all. This is a very unusual occurrence for us.