The Chicago Mercantile Exchange had a technical outage, disrupting multiple financial markets across Asia and Europe. A cooling problem at a data center in Aurora, Illinois caused the 10-hour halt, frustrating traders. The outage affected contracts tracking the S&P 500 Index and other assets. The disruption revealed the concentration of futures markets and limited alternative venues for trading. Trading operations have since been restored.

Read more at Yahoo Finance: CME Trading Is Restored to Wrap Up Week After Hours-Long Outage