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Ministry of Defence and other government buildings behind Westminster Bridgein London, Thursday March 23, 2017 (Tim Ireland / AP)

The U.K.'s Ministry of Defence said Tuesday that four members of its military have been arrested under the Terrorism Act on suspicion of belonging to National Action, a banned neo-Nazi group, and planning terrorist acts, per Reuters.

The four arrests were made by counter-terrorism officers in the English cities of Birmingham, Ipswich, and Northampton, and in Powys, Wales. "The arrests were pre-planned and intelligence-led; there was no threat to the public's safety," West Midlands Police said.

Why it matters: National Action became the first far-right group to be outlawed in Britain last year after the group praised the murder of Jo Cox, a member of parliament who was killed by a man motivated by Nazism and white supremacist ideology. Meanwhile, the U.K.'s threat level is currently ranked as "severe," the second-highest level, meaning an attack is highly probable.

Go deeper

Off the Rails

Episode 7: Trump turns on Pence

Photo illustration: Eniola Odetunde/Axios. Photos: Elijah Nouvelage, Alex Wong/Getty Images

Beginning on election night 2020 and continuing through his final days in office, Donald Trump unraveled and dragged America with him, to the point that his followers sacked the U.S. Capitol with two weeks left in his term. Axios takes you inside the collapse of a president with a special series.

Episode 7: Trump turns on Pence. Trump believes the vice president can solve all his problems by simply refusing to certify the Electoral College results. It's a simple test of loyalty: Trump or the U.S. Constitution.

"The end is coming, Donald."

The male voice in the TV ad boomed through the White House residence during "Fox & Friends" commercial breaks. Over and over and over. "The end is coming, Donald. ... On Jan. 6, Mike Pence will put the nail in your political coffin."

Big Tech's post-riot reckoning

Photo illustration: Sarah Grillo/Axios. Photo: Tasos Katopodis/Getty Images

The Capitol insurrection means the anti-tech talk in Washington is more likely to lead to action, since it's ever clearer that the attack was planned, at least in part, on social media.

Why it matters: The big platforms may have hoped they'd move to D.C.'s back burner, with the Hill focused on the Biden agenda and the pandemic out of control. But now, there'll be no escaping harsh scrutiny.

40 mins ago - Technology

Why domestic terrorists are so hard to police online

Illustration: Eniola Odetunde/Axios

Domestic terrorism has proven to be more difficult for Big Tech companies to police online than foreign terrorism.

The big picture: That's largely because the politics are harder. There's more unity around the need to go after foreign extremists than domestic ones — and less danger of overreaching and provoking a backlash.