To answer my own question above, I've attached a poem by Charles Martin called "After 911," which appeared in The Hudson Review in 2005. That's a few years after the fact, but maybe it took him time to write it. At any rate, he wrote the impossible--not about a riot, but about a disaster that people felt would be impossible to write about when it happened.
I think he did a great job.
http://www.hudsonreview.com/martinAu05.pdf