Online forum My Militia — which promotes itself as an “American Patriot Network” — has more than 20,000 users and has seen a flurry of activity in recent weeks.
The network claims there are 544 militias currently active in the US, carries instructions on how to make explosives and improvised weapons, survivalist tips, threads dedicated to conspiracy theories, and lists of names of members of “Antifa”.
Many of the self-appointed militiamen say they are preparing to ride out mass civil unrest, while others more dramatically predict an upcoming “Civil War”.
It comes after a string of violence over the summer with Donald Trump blaming extreme left-wing groups for stoking mayhem.
Some groups are braced for attacks by “Antifa” who Trump branded “scum” after clashes at a recent marches in Washington DC.