Marriott International said early Friday that data on roughly 500 million customers staying at Starwood hotel properties had been compromised in a breach that gave unknown attackers access to the Starwood network since 2014. The company said it has not finished identifying duplicate information in the database, but believes it contains information on up to approximately 500 million guests who made a reservation at a Starwood property. The hotel giant said that on September 8, 2018, it received an alert from an internal security tool regarding an attempt to access the Starwood guest reservation database. The company said it “quickly...