Thousands of customers posted angry messages on social networking sites and Twitter against BT after the company’s Internet service crashed, hiting services from London to Swansea.

BT has confirmed the disruption and has said that "power failure" at a major exchange in Birmingham caused the outage.

Thousands of BT Broadband customers across the UK were affected by the disruption. Most of the angry posts said that BT service was down or running slow. Some customers complained about BT’s customer service.

According to The Guardian, Sheffield United football club said that its online ticketing service was down because of the disruption.

A BT spokesman said, "We can confirm that, as a result of a power failure at one of our major exchanges, some customers may be experiencing loss of broadband.

"Our engineers are on site and the majority of customers’ service has already been restored. We are working to restore service to remaining customers as soon as possible."

Later, the company said that all services were up and running again.

"We have been doing our very best to keep customers informed."

"All services have now been restored, with the majority of BT’s consumer broadband customers’ service being restored within just one hour.

"Some business customers’ broadband service may have been affected for a slightly longer period. Should any customers continue to experience difficulty in accessing their broadband service, they are advised to turn their hub or modem off and on again."

"BT apologises for any inconvenience caused," said the company.