Some 10 million people in the United States saw politically divisive ads on Facebook that the company said were purchased in Russia in the months before and after last year’s US presidential election, Facebook said on Monday.

Facebook, which had not previously given such an estimate, said in a statement that it used modelling to estimate how many people saw at least one of the 3,000 ads. It also said that 44% of the ads were seen before the November 2016 election and 56% were seen afterward.

The ads have sparked anger towards Facebook and, within the United States, towards Russia since the world’s largest social network disclosed their existence last month. Moscow has denied involvement with the ads.

Facebook has faced calls for increased US regulation from US authorities. Chief Executive Mark Zuckerberg has outlined steps that the company plans to take to deter governments from abusing the social media network.

Earlier on Monday, Facebook said in a separate statement that it planned to hire 1,000 more people to review ads and ensure they meet its terms, as part of an effort to deter Russia and other countries from using the platform to interfere in elections.

The latest company statement said that about 25% of the ads were never shown to anyone.

“That’s because advertising auctions are designed so that ads reach people based on relevance, and certain ads may not reach anyone as a result,” Elliot Schrage, Facebook’s vice president of policy and communications, said in the statement.

For 99% of the ads, less than $1,000 was spent, he said. The total ad spend was $100,000, the company has said.

Still, he said it was possible Facebook would find more Russia-linked U.S. ads as it continues to investigate.

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