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– The Russian hackers who stole e-mails from the Democratic National Committee as part of a campaign to interfere in the 2016 election have been trying to steal information from the U.S. Senate, according to a report published Friday by a computer security firm.

Beginning in June, the hackers set up websites meant to look like an e-mail system available only to people using the Senate’s internal computer network, said the report by Trend Micro. The sites were designed to trick people into divulging their personal credentials.

These “spear phishing” techniques are frequently used by the Russian group, which the company dubs Pawn Storm, to read or copy e-mails or other private documents.

“This group is politically motivated,” said Mark Nunnikhoven, Trend Micro’s vice president for cloud security.

Trend Micro has linked the group, better known as Fancy Bear, to activities targeting political organizations in Germany and the campaign of French President Emmanuel Macron. Last year, U.S. intelligence agencies concluded the group, which officials say is associated with Russian military intelligence, stole e-mails from the DNC that were subsequently provided to WikiLeaks.

Nunnikhoven said that his company had given information about Pawn Storm’s activities to the Senate. The office of the Senate sergeant at arms, which handles computer security for the chamber, declined to comment.

The report didn’t say whether the operation targeting the Senate had successfully stolen information, and Nunnikhoven declined to say because the matter is still being investigated.

Pawn Storm’s campaign against the Senate comes as lawmakers prepare for midterm elections in November. Nunnikhoven said that the group has a pattern of targeting political organizations in the run-up to elections.

Trend Micro concluded that hacking campaigns against political organizations were unlikely to dissipate. “Political organizations have to be able to communicate openly with their voters, the press and the general public. This makes them vulnerable to hacking and spear phishing,” the company said in its report.