Eh, 9/11 seems to practically be the Jihadi holiday for attacking something American, so it's not exactly a BS alert.

Even the independent and lone wolf Jihadi types tend to want to make their mark on 9/11. I would say it's a good day to be armed and on the lookout for any nefarious action on their part.

Just like Communists and Anarchists tend to do their things some time around May Day, or tax protesters and anti government types tend to do stuff mid to late April. September 11 is Jihadi season.