Twitter users have reported being unable to use the platform across the UK with thousands said to be affected.
The Down Detector website suggests issues were first reported after 1pm. Most reported problems are to do with accessing the Twitter app and website accounting for 48% and 49% of reported issues respectively.
Over 30,000 reports have been made on the site in the last hour, with users given an error message when they log on to Twitter. The social media site itself has not confirmed that there is an outage.