A growing number of academics and activists are calling for US authorities to fully audit or recount the 2016 presidential election vote in key battleground states, in case the results could have been skewed by foreign hackers.

According to a report in The guardian, the loose coalition, which is urging Hillary Clinton’s campaign to join its fight, is preparing to deliver a report detailing its concerns to congressional committee chairs and federal authorities early next week, according to two people involved.

The document, which is currently 18 pages long, focuses on concerns about the results in the states of Michigan, Pennsylvania and Wisconsin.

“I’m interested in verifying the vote,” The guardian report said quoting Dr Barbara Simons, an adviser to the US election assistance commission and expert on electronic voting. “We need to have post-election ballot audits.” Simons is understood to have contributed analysis to the effort but declined to characterise the precise nature of her involvement.

A second group of analysts, led by the National Voting Rights Institute founder John Bonifaz and Professor Alex Halderman, the director of the University of Michigan’s center for computer security and society, is also taking part in the push for a review, and has been in contact with Simons. Bonifaz declined to speak on the record.

The developments follow Clinton’s surprise defeat to Donald Trump in the 8 November vote, and come after US intelligence authorities released public assessments that Russian hackers were behind intrusions into regional electoral computer systems and the theft of emails from Democratic officials before the election.