A portion of the advertisements Facebook sold to Russian-based pages during the 2016 presidential election campaign were also visible on Instagram, the social media giant said on Friday.

Facebook said in a blog post that of the 3,000 advertisements the company disclosed to Congress, five percent were seen on Instagram.

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The company said roughly $6,700 was spent on the ads seen on Instagram.

All 3,000 of the ads on Facebook are said to have cost $100,000.

Facebook said that an estimated 10 million people in the U.S. were exposed to the ads.

The development comes as the platform finds itself under intense scrutiny after it revealed in September that a Kremlin-linked group known as the Internet Research Agency had purchased $100,000 in political advertisements.

Later reports revealed that the ads bought by the Russian group sought to spark social and racial divisions among Americans.

The House Intelligence Committee has formally extended invitations for executives from Facebook, Twitter and Google to formally testify on Nov. 1 at a hearing on Russian election interference, according to a source familiar with the committee.