Many customers of BT have experienced problems with its broadband and telephone services.
The firm confirmed the issue in a tweet this morning, and said it had been resolved three and a half hours later.BT said the power fault at one of its partner’s sites in London was the cause, but did not name the company involved.
The trouble also caused several banks to be unable to offer online services.
BT found the ultimate responsibility lay with the California-based data centre operator Equinix.
A spokeswoman for BT said: "We're sorry that some BT and Plusnet customers experienced problems accessing some internet services this morning.
"Around 10% of customers' internet usage was affected following power issues at one of our internet connection partners' sites in London.
The issue has now been fixed and services have been restored."
Managing director at Equinix, Russell Poole, said:"Equinix can confirm that we experienced a brief outage at the former Telecity LD8 site in London earlier this morning."This impacted a limited number of customers, however service was restored within minutes. Equinix engineers are on site and actively working with customers to minimise the impact."
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