Web hosting company Bluehost has suffered a major network outage, affecting thousands of websites and many customers.
The company is in crisis mode on Twitter, reassuring users that it is "continuing to implement a solution" and "working to fix the issues".
Bluehost earlier claimed sites were returning online but Twitter has been awash with complaints - with more coming in every few seconds.
FYI we had issues during maintenance last night. We've been working through the night to fix things ASAP, stay tuned for more updates.— Bluehost (@bluehost) August 2, 2013
Seven hours ago now, Bluehost tweeted: "There was an unexpected issue while we were preforming maintenance on our network. Your account available in next few minutes."
Some customers are threatening to leave the company.
BlueHost earlier said there was an "unexpected issue while performing maintenance" and that websites are back online now - but judging by this Twitter stream this is not the case.
Even Bluehost's own website appears to be down.
There has been speculation Bluehost suffered a massive DoS attack but this has not been confirmed. Our sister title, ChannelEye, was affected by the problem.
*Update Bluehost is apologising every minute or so. But the company's crisis dictionary is only half a page long. Bluehost's Twitter team has said the "solutions" it's "implementing" will lead to sites being "back immediately" or "back ASAP" - and it's been at it for hours.