I know I would be pretty upset if this happened to my synagogue - Threat closes New Jersey synagogue.

This reminds me of a story - when I was living in Buenos Aires, I would go to a local conservative synagogue on Friday nights with my girlfriend/fiancee/now wife, and one evening we were confronted with more than the usual security - armed guards, police cars, etc. At first we thought that there was a threat, but we decided to go in anyway - we didn't feel that anyone should prevent us from praying on Shabbat. As it turns out, the Israeli ambassador to Argentina was visiting that night, but I did get the brief feeling of what it might be like to not feel safe during a services.