E-commerce giant Amazon announced Thursday it will acquire primary health care organization One Medical in a deal valued at roughly $3.9 billion, marking another expansion for the retailer into health care services.

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A nonprofit that advocates for stricter antitrust laws raised concerns about Amazon acquiring One Medical. The American Economic Liberties Project in Washington said it’s unclear if Amazon will protect patients and their sensitive medical records.

“Allowing Amazon to control the health care data for another 700,000 plus individuals is terrifying,” Krista Brown, the group’s senior policy analyst, said in a statement Thursday. “Amazon has no business being a major player in the healthcare space, and regulators should block this $4 billion deal to ensure it does not become one.”

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