Facebook and Twitter say they have not found evidence of Chinese meddling in the 2018 elections, according to a Bloomberg report.

Company officials told Bloomberg that they have not found evidence of Chinese campaigns so far, though they have identified misinformation campaigns that seem to come from Russia and Iran.

Other tech firms, namely cybersecurity companies FireEye Inc. and Symantec Corp, have said they have found no evidence linking China to election meddling.

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Twitter confirmed to The Hill that the company hasn’t found evidence of Chinese meddling so far, but emphasized that it is extremely difficult to determine with certainty where disinformation originates.

Facebook could not immediately be reached for comment.

The Office of the Director of National Intelligence, Justice Department, FBI, and Department of Homeland Security said in a joint statement last Friday that they are concerned about "ongoing campaigns" from China to spread "disinformation" and "foreign propaganda" heading into the elections.

"We are concerned about ongoing campaigns by Russia, China and other foreign actors, including Iran, to undermine confidence in democratic institutions and influence public sentiment and government policies," the statement said. "These activities also may seek to influence voter perceptions and decision making in the 2018 and 2020 U.S. elections."

President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE accused China specifically of meddling in the midterm elections last month.

In October, Vice President Pence tore into China for carrying out "an unprecedented effort to influence American public opinion, the 2018 elections, and the environment leading into the 2020 presidential elections" to hurt Trump and the GOP.

China has repeatedly denied interfering in U.S. elections.

Neither the White House nor the agencies who issued the joint statement could be reached for immediate comment at the time of publication. The Justice Department declined to comment.

—Updated at 10:49 a.m.