(NEWSNet/AP) — UnitedHealth says files with personal information that could cover a “substantial portion of people in America” may have been taken in the cyberattack earlier this year.

The company said Monday that it didn't see signs that doctor charts or full medical histories were released after the attack. But it may take several months of analysis before UnitedHealth can identify and notify people who were affected.

UnitedHealth did say that some screen shots containing protected health information or personally identifiable information were posted for about a week online on the dark web, which standard browsers can’t access.

The company is still monitoring the internet and dark web and said there hasn't been additional information posted.

The company also is offering free credit monitoring and identity theft protection for people affected by the attack.

The attack disrupted payment and claims processing for doctor's offices and health care systems across the U.S.

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