At least one bank named by hacktivists as a target for cyberattacks is warning customers they may encounter service snags when logging in to their accounts.
PNC Bank (PNC) said Tuesday evening in a Facebook post that its website has "experienced an unusual volume of Internet traffic."
About an hour later, the $301 billion-asset bank took to Twitter to warn customers to expect possible delays. "Some customers may experience slowness or difficulty accessing online & mobile banking," PNC tweeted. "We are working to quickly resolve this issue."
The messages by PNC come roughly a day after a group that calls itself the al-Qassam Cyber Fighters Group, which has claimed responsibility for so-called denial of service attacks on at least 10 banks worldwide since September, vowed more attacks on PNC, JPMorgan Chase (JPM), Bank of America (BCA), U.S. Bank (USB) and SunTrust (STI).
A PNC spokeswoman did not respond immediately to a request for comment.
On Tuesday night, Sitedown.co, which records website outages, had logged roughly 668 reports of people claiming to be unable to log in to their accounts at Bank of America within the preceding 24 hours compared with 995 reports in the past seven days.
"We're aware of the reports of possible cyberattacks and we're monitoring our systems, which are fully operational," Bank of America spokesman Mark Pipitone said in an email. "We've reached out individually to a small number of customers who reported issues to us yesterday."
The al-Qassam group pledges to continue the attacks, which flood lines that connect banks to the Internet, as long as a trailer for "The Innocence of Muslims," American-made, anti-Muslim film, remains posted on YouTube.