Police began the investigation this past week following media reports that a CD and a DVD containing customer information had been found in the heaps of rubbish in a red-light district in southern Seoul.
It was actually one of the suspects who tipped the media, police said, as they believed that the value of the data would rise if the leak gained public attention.
The CD and DVD contained Excel files with national identification numbers and e-mail addresses of 11 million people, including high-profile figures such as the chief of the National Police Agency and the National Assembly speaker, police said.
Two of the suspects had access to the customer database as employees of a GS Caltex call center subsidiary -- a 28-year-old man identified by his family name Jeong and a 30-year-old female employee identified as Bae. The other two were identified as Wang and Kim, both in their 20s.
The three male suspects manufactured six copies in DVD through a computer at Jeong's office between July and August. Bae organized the information in Excel files, police said.
The probe has mostly focused on company insiders with access to customer data since there is no evidence of hacking, investigators said.
The data leak has severely hurt the company image, with the country still reeling from large-scale information spills at technology firms. Internet Auction Co., the local unit of U.S. online auction house eBay Inc., was severely criticized in February for failing to prevent the theft of 10.8 million users' information by a hacker. Mobile carrier LG Telecom Co. was found in May to have had its subscribers' information exposed to a hacker.
Hanarotelecom Inc., a fixed-line operator, faces a class-action lawsuit after its former chief was found to have sold the private information of 6 million users to telemarketers.
Trying to placate public criticism, GS Caltex swiftly ran a front page public apology in newspapers and operated a round-the-clock customer call center over the weekend.

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