BT and TalkTalk both appear to be experiencing issues this afternoon.
According to DownDetector, the issues with BT started at around 12:24 BST, while the problems with TalkTalk started at 12:25 BST.
Of those who reported issues with BT, 91% said they couldn't access the internet, 6% were having problems with their phone, and 1% with email.
Meanwhile, of those who reported problems with TalkTalk, 94% said they couldn't access the internet, 3% were having phone problems, and 2% said they had no network or reception.
A BT spokesperson has confirmed that the outage is due to a fire at a local site in Newcastle.
They said: "We’re aware some customers in the Newcastle area are currently experiencing problems when trying to make calls or connect to the internet.
"This is due to a fire at a local site in Newcastle, which has now been contained. Our engineers are on site and working quickly to resolve this. We apologise to our customers for any inconvenience caused.”
Several frustrated customers have taken to Twitter to discuss this morning's issues.
One user said: "I don’t seem to have a broadband connection. My WiFi is accessible but no internet access when ive checker router. Is the service down? (North East England)"
Another added: "What is happening with talk talk internet at the moment, nothing seems to ever run smooth with this company internet is always down, how are you going to rectify this as people have to work from home and depend on your service."
And one wrote: "hey BT internet is down across the whole of the Eden valley Cumbria. Not ideal when I have a dissertation to write, please sort it out."
This isn't the first time that one of the major networks has experienced issues in recent weeks.
Earlier this week, Sky Broadband crashed in the Yorkshire and Humber area, leaving frustrated users unable to get online.
