Russian operatives spent tens of thousands of dollars on ads across Google products, including YouTube and Google search, according to reports.
The report said the company discovered the Russian presence by siphoning data from Twitter. The Washington Post report is based on anonymous sources familiar with the investigation.
In a statement, Google said it has a "set of strict ads policies including limits on political ad targeting and prohibitions on targeting based on race and religion."
"We are taking a deeper look to investigate attempts to abuse our systems, working with researchers and other companies, and will provide assistance to ongoing inquiries," the statement continued.
US intelligence agencies have concluded that Russian President Vladimir Putin directed a disinformation campaign aimed at helping Donald Trump win the presidential election.
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