Facebook has turned over its data on ads bought by a Russian company during the 2016 presidential race to special counsel Robert Mueller, Reuters reported Wednesday.

The tech company gave Mueller’s team copies of the ads as well as the identities of the ads’ buyers, a source told Reuters.

The handover of information comes after Facebook revealed earlier Wednesday that thousands of ads posted on the site over the past two years were linked to fake Facebook accounts based out of Russia.

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Facebook’s chief security officer, Alex Stamos, said nearly 500 accounts had spent roughly $100,000 on about 3,000 ads, but that the accounts had since been suspended.

Facebook reportedly informed congressional investigators about the ads on Wednesday, according to The Washington Post.