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Cambridge Analytica may have had data from more unwitting Facebook users than originally thought.

Facebook now says that the data firm, which collected data about users without their permission, may have collected data on as many as 87 million people. Original reports from the New York Times pegged that number at closer to 50 million people.

“In total, we believe the Facebook information of up to 87 million people — mostly in the U.S. — may have been improperly shared with Cambridge Analytica by apps that they or their friends used,” Facebook CTO Mike Schroepfer wrote in a blog post Wednesday.

Facebook says it will begin alerting those users that their data may have been part of this batch on Monday, April 9. The company plans to put a link at the top of every Facebook user’s News Feed next Monday to help them understand which third-party apps have their data. That alert will also include whether or not your data was part of the set obtained by Cambridge Analytica.

The Cambridge Analytica debacle has created a firestorm for Facebook. In the weeks since the news broke, the company has scrambled to make sweeping changes to its data policies in an effort to soothe user and investor concerns. Those changes included rewriting Facebook’s terms of service and severely cutting access to the types of data third-party developers can collect from the company.

Facebook CEO Mark Zuckerberg will also testify before a House Congressional committee next week on the company’s data privacy practices.

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