An outage to BT's broadband service has left many users struggling to access the internet.
The UK's biggest internet provider reported outages in several areas at around 9.30am.
A spokesman said the problems appeared to be mainly affecting London and the south east.
BT's customer support Twitter account said it was attempting to restore service as quickly as possible.
The company said: "Some BT Broadband customers have reported problems accessing websites this morning. Sorry, we're aware of a problem & working to fix asap."
A BT spokesman said: "We're sorry that some BT and Plusnet customers are experiencing problems accessing some internet services this morning.
"This is due to power issues at one of our internet peering partners' sites in London. Engineers are working to fix things as fast as possible."
The outage comes a day after MPs warned that BT must "put its house in order" or face a break-up after failing to invest in its Openreach network arm potentially to the tune of hundreds of millions of pounds a year.
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