Over the past week there has been huge attention to a leak of data from the Japanese mobile giant NTT DoCoMo in the name of it supporting CISPA. The news has been a big subject across many different Japanese sites after @LulzSecWiki released a dump of accounts that contain personal credentials. Today the same account has announce that the docomo-usa.com website is offline > TANGODOWN – docomo-usa.com #LulzSec #AntiSec — LulzSecWiki (@LulzSecWiki) April 29, 2013
I have confirmed with LulzSecWiki that this is an attack and not the result of the recent leak and the site (https://www.docomo-usa.com/) has been offline now for over 30 minutes 12 hours at time of publishing which is only a short time but it is confirmed as down. 
An attack like takes away the possibility of sales and client access to the American based customers or people researching information related to DoCoMo services and products. Yesterday i also announced that DoCoMo has confirmed this breach and that it was from a third party sales provider which is most likely the USA based site as many of the account details were related to its domain.