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About 20 million pieces of check-in information were leaked in October because of security vulnerabilities at a service provider for 4,500 hotels, the Mirror Evening News reported.
About 220,000 pieces of the leaked information were from Beijing residents. Of that total, 29,063 pieces of information were from women 18 to 30 years old. A middle-aged man changed his family name because of the incident, the report said.
