Gunmen, in a vehicle usually used by the military, were arrested by police near a counting center in the city of Philadelphia, Pennsylvania.
Violence surrounding the US presidential election was feared and Donald Trump's latest statements have added fuel to the fire.
A few American states are still counting the postal ballots, which will be decisive as Donald Trump and Joe Bidense dispute the White House.
The climate is far from calm, especially in Philadelphia (Pennsylvania), where armed men have been arrested by the police on their way to a counting center.
This scene took place Thursday evening, a few hours after Donald Trump's speech.
The incumbent reiterated that he was a victim of fraud and that the ballots sent by mail - a technique rather used by Democratic voters - were part of an obscure strategy to win Joe Biden.
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Accusations without proof, but which galvanized supporters of Donald Trump.
Men armed with machine guns were thus spotted in a Hammers, that is to say a 4x4 used by the American army.
The police fear that the armed men did not want to attack this sorting center.
On the suspects' vehicle, police found stickers displaying messages associated with QAnon, a far-right conspiracy movement that some Trump supporters are followers of.
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Pennsylvania is one of the states in the midst of a recount where Trump is leading the race, but narrowly.
To win the presidential election, therefore, he cannot afford to lose this state.