Why Google Didn't Post a 9/11 Image

If you've used Google for any amount of time for great search results, you are most likely familiar with the images that Google uses draped over and around it's Google logo to recognize particular events, birthdays, etc.  To see actual examples of past logo images, click here:  Google Logos From The Past

Yesterday, however, this was not the case.  Google did not have a special image of any kind on 9/11/09.  Did Google ignore September 11th?

Ask.com and Bing.com both had images in memory of the tragic events of 09/11/2001 on their search engines, so why not Google?  It is unknown at this point for the reasons behind the absence of any type of image.

This is disappointing since this date is one of the worst dates in American History.  Unless you knew about Google's blog, you wouldn't know that they did actually make a post on September 10th that you can check out here:  Google's September 11th Blog