Slack, the messaging service used by offices around the world, is down due to an unknown issue.

On X, the company said: "We're very sorry for the inconvenience. We're working hard to resolve this issue as quickly as possible."

They added: "Our engineers are investigating what's happened. We apologize for the disruption and we hope to be back to normal soon. Please check https://slack-status.com for any updates. We appreciate your patience while we work on it!"

Users began reporting issues with the app on social media this afternoon.

An update from just after 4pm on the company's website reads: We're still working to restore functionality to affected Slack features but have also discovered some workflows may also be experiencing issues.

"We appreciate your patience as we sort this out and will be back with another update soon."

Then, the company followed up just over 20 minutes later with another update: "We're still working to restore functionality to affected Slack features such as sending messages, workflows, threads and other API-related features.

"Users may also experience issues when attempting to log-in. Thank you for your continued patience as we continue investigating. We'll be following up with further updates as they become available."