Updated HSBC customers were once again locked out of online banking this morning, following an apparent DDoS attack on the bank.
The bank tweeted: "HSBC UK internet banking was attacked this morning. We successfully defended our systems.
It added: "We are working hard to restore services, and normal service is now being resumed. We apologise for any inconvenience."
The Register has contacted HSBC for more comment and is awaiting a response.
A spokesperson for HSBC told the BBC: "HSBC internet banking came under a denial of service attack this morning, which affected personal banking websites in the UK."
Users have been unable to access the bank's browser- and app-based banking since early this morning.
One reader got in touch to report they had experienced problems since 8.30am this morning.
Another reader reported that when he tried to login via a browser, he was redirected to "www.security.hsbc.co.uk".
Numerous customers are being redirected to HSBC's phone line as a result of the outage by the bank's Twitter feed.
This is the second outage to have occurred at the bank this month. Earlier this month the bank pushed forward its chief operating officer to "profoundly apologise" for an online outage that lasted two days.
It seems January has been a month of outages for banks, with customers of RBS and Natwest also unable to access their online banking accounts two weeks ago. ®