NEW YORK -- Bank of America Corp. says its online banking service was down for about four hours but service has been restored.

Tara Burke, a representative for the nation's largest bank, declined to specify a reason for Friday's outage except to say that it was a "temporary system" issue.

She could not say whether the site has experienced a similar across-the-board outage before.

The bank, based in Charlotte, said service was restored at around 5:15 p.m. The outage began at around 1:25 p.m. Some customers may still have trouble signing on because of the volume of people trying to access the site.

Customers also can get account information from ATMs or banking centers. Burke said none of Bank of America's 18,000 ATMs was affected by the outage.

Bank of America is one of the largest banks in the Charleston region and in South Carolina based on deposits.