NEW YORK (CBSNewYork) — The popular social media app Timehop reports a data breach involving millions of users.

Timehop connects to users’ social media accounts and shows what people posted that day throughout the years.

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The breach happened on July 4 and Timehop says it was able to intercept the breach while it was in progress. The names, email addresses and phone numbers of 21 million users were exposed to hackers.

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But the company says the breach did not involve users’ photos and social media posts that are stored on Timehop.

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As a result, Timehop says users may have been logged out of the app to reset all of the keys. They are continuing to investigate the incident.