Bloomberg trading screens in Asia and Europe on Friday morning went dark, with an outage that caused a wave of confusion on social media and some bond deals to be postponed until after the weekend, according to several bankers.

The terminals, which provide real-time financial data but are also the go-to means of communication for hundreds of thousands of traders, investors and bankers globally, failed shortly after the European market open. They later came back up, but individuals all across Europe complained that the service remained patchy.