Quote:Slack, the widely used messaging platform, experienced a major disruption in service on Monday as many employees in the United States returned to work after the holidays.

The company initially called the service problem an “incident” in a statement on its website, then upgraded it to an outage an hour later. “Customers may have trouble loading channels or connecting to Slack at this time,” the statement said. “Our team is investigating and we will follow up with more information as soon as we have it. We apologize for any disruption caused.”

The website Downdetector, which tracks internet disruptions, recorded a spike in reported problems with Slack at about 10 a.m. Eastern time, and the company posted its statement about the problem at 10:14 a.m. Users could not send messages, load channels, make calls or log in to the service.

Half an hour later, Slack said it was still investigating. At 11:20 a.m., the company said, “All hands are on deck on our end to further investigate.”

Service began to resume for some users around 12:20 p.m. Eastern.