Fifth Third bank customers took to twitter today to report that they could not access the bank's site with mobile apps, and asking if the site had been hacked. The bank responded via twitter, "we're assessing delays on 53.com, which may have impacted mobile access." A later tweet added, "Accounts have not been impacted and are secure. More information to come." Cincinnati news outlets (where the bank is based), later reported that Fifth Third had suffered a second "denial of service" cyber attack this week (the first last Thursday). The Wall Street Journal has reported on waves of denial of service cyber attacks hitting U.S. Banks since Fall 2012.