Bank of America’s consumer Web site has been hit with a long outage because of what the company called “technical issues.”

The bank confirmed the problems through its Twitter account, telling consumers that it knew about the issues and was “working to resolve as soon as possible.”

The bank did not immediately return a request for comment on what may have caused the attack. People familiar with the situation say it’s an internal glitch.

Banks are a prime target for hackers who have used methods such as denial-of-service attacks to shut down sites and made serious attempts to extract data from the companies or straight from consumers.

In September, Bank of America, JP Morgan Chase and other U.S. firms were the targets of a series of attacks blamed on Iran. Last week, federal prosecutors charged three men with distributing the “Gozi” virus to over 40,000 U.S. computers and 1 million computers worldwide, reportedly causing tens of millions of dollars in losses.

And late last year, McAfee Labs warned that hackers may try to target 30 major U.S. national, investment and regional banks early in 2013.

As of Friday afternoon, the bank’s desktop and mobile Web sites were down.

Related stories:

Cybersecurity firm identifies ‘credible threat’ to 30 U.S. banks

Feds: 1 guilty plea, 2 others arrested over virus that infected more than 1M computers

Iran blamed for cyberattacks on U.S. banks and companies

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