Facebook Gave Mueller More Details on Russian Ad Buys Than Congress

Facebook Inc. has handed over to special counsel Robert Mueller detailed records about the Russian ad purchases on its platform that go beyond what it shared with Congress last week, according to people familiar with the matter.

The information Facebook shared with Mr. Mueller included copies of the ads and details about the accounts that bought them and the targeting criteria they used, the people familiar with the matter said. Facebook policy dictates that it would only turn over “the stored contents of any account,”...