A new threat intelligence report from Microsoft says foreign adversaries have showed continued determination to influence the U.S. election and there are signs their activity will intensify as Election Day nears.

Russia, China and Iran are intent on fanning divisive narratives to divide Americans ahead of the Nov. 5 U.S. elections and may consider fomenting violence after voters go to the polls, U.S. intelligence officials said on Tuesday.

Microsoft found that Iranian hackers are looking for vulnerabilities in election-related websites, as part of a broader increase in election interference efforts by foreign nations including Russia and China.