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This undated file photo provided by the Ford County Sheriff's Office in Paxton, Ill., shows Michael Hari. (Ford County Sheriff's Office via AP File)

The leader of an Illinois anti-government militia group who authorities say masterminded the 2017 bombing of a Minnesota mosque was sentenced Monday to 53 years in prison on several civil rights and hate crimes for the attack, which left a community terrified.

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An American flag is unfurled at the Pentagon in Washington, Saturday, Sept. 11, 2021, at sunrise on the morning of the 20th anniversary of the terrorist attacks. (AP Photo / Alex Brandon)

The document released Saturday, on the 20th anniversary of the attacks, is the first investigative record to be disclosed since President Joe Biden ordered a declassification review of materials that for years have remained out of public view. 

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A memorial flag is brought onto the stage during ceremonies to commemorate the 20th anniversary of the Sept. 11 terrorist attacks, Saturday, Sept. 11, 2021, at the National September 11 Memorial & Museum in New York. (AP Photo/John Minchillo)

The ceremony at ground zero in New York began exactly two decades after the deadliest act of terrorism on U.S. soil started with the first of four hijacked planes crashing into one of the World Trade Center’s twin towers.

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The terrorist attacks of Sept. 11, 2001 have changed the world in ways both “subtle and profound,” said DePaul University history professor Thomas Mockaitis. (WTTW News)

Saturday marks the 20th anniversary of the deadliest terrorist attack on U.S. soil. Local experts join us to discuss what we’ve learned about terrorist threats since then — and how safe we are today.

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President Joe Biden returns a salute as he walks to board Air Force One to travel to Louisiana to view damage caused by Hurricane Ida, Friday, Sept. 3, 2021, in Andrews Air Force Base, Md. (AP Photo / Evan Vucci)

President Joe Biden will visit all three 9/11 memorial sites to commemorate the 20th anniversary of the Sept. 11 attacks and pay his respects to the nearly 3,000 people killed that day. 

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A U.S military aircraft takes off from the Hamid Karzai International Airport in Kabul, Afghanistan, Monday, Aug. 30, 2021. (AP Photo / Wali Sabawoon)

The United States completed its withdrawal from Afghanistan late Monday, ending America’s longest war and closing a chapter in military history likely to be remembered for colossal failures, unfulfilled promises and a frantic final exit.

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A destroyed vehicle is seen inside a house after a U.S. drone strike in Kabul, Afghanistan, Sunday, Aug. 29, 2021. (AP Photo / Khwaja Tawfiq Sediqi)

A U.S. drone strike blew up a vehicle carrying “multiple suicide bombers” from Afghanistan’s Islamic State affiliate on Sunday before they could attack the ongoing military evacuation at Kabul’s international airport, American officials said.

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Smoke rises from a deadly explosion outside the airport in Kabul, Afghanistan, Thursday, Aug. 26, 2021. (AP Photo / Wali Sabawoon)

Two suicide bombers and gunmen attacked crowds of Afghans flocking to Kabul’s airport Thursday, transforming a scene of desperation into one of horror in the waning days of an airlift for those fleeing the Taliban takeover.

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A gate is seen at the Bagram Air Base in Afghanistan, Friday, June 25, 2021. (AP Photo / Rahmat Gul)

The withdrawal from Bagram Airfield is the clearest indication that the last of the 2,500-3,500 U.S. troops have left Afghanistan or are nearing a departure, months ahead of President Joe Biden’s promise that they would be gone by Sept. 11.

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President Joe Biden speaks from the Treaty Room in the White House on Wednesday, April 14, 2021, about the withdrawal of the remainder of U.S. troops from Afghanistan. (AP Photo / Andrew Harnik, Pool)

President Joe Biden said Wednesday he will withdraw remaining U.S. troops from the “forever war” in Afghanistan, declaring that the Sept. 11 terror attacks of 20 years ago cannot justify American forces still dying in the nation’s longest war.

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A mob breaches the U.S. Capitol on Jan. 6, 2021. (WTTW News via CNN)

The impeachment trial is over, but hundreds of rioters who stormed the Capitol on Jan. 6 are still facing criminal charges. We discuss the implications of new research showing some surprising findings on the identities and backgrounds of those rioters.

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In this Wednesday, Jan. 6, 2021 file photo, Trump supporters try to break through a police barrier at the Capitol in Washington. (AP Photo / Julio Cortez, File)

The Department of Homeland Security did not cite any specific plots, but pointed to “a heightened threat environment across the United States” that it believes “will persist” for weeks after Biden’s Jan. 20 inauguration. 

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In this June 20, 2020 file photo, gun-carrying men wearing Hawaiian print shirts associated with the boogaloo movement watch a demonstration near where President Trump had a campaign rally in Tulsa, Okla. (AP Photo / Charlie Riedel, File)

People following a violent movement that promotes a second U.S. civil war or the breakdown of modern society have been showing up at recent protests wearing not only tactical gear but an unlikely public and online symbol: the so-called Hawaiian shirt. 

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In this Wednesday, Jan. 6, 2021 file photo, Trump supporters try to break through a police barrier at the Capitol in Washington. (AP Photo / Julio Cortez, File)

Right-wing extremism has previously played out for the most part in isolated pockets of America and in its smaller cities. The deadly assault by rioters on the U.S. Capitol, in contrast, targeted the very heart of government. 

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District of Columbia National Guard stand outside the Capitol, Wednesday night, Jan. 6, 2021, after a day of rioting protesters. (AP Photo / John Minchillo)

President Joe Biden has directed law enforcement and intelligence officials in his administration to study the threat of domestic violent extremism in the United States, an undertaking being launched weeks after a mob of insurgents loyal to Donald Trump stormed the U.S. Capitol.

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A chain blocks the sidewalk entrance to the front steps of the Maine State House, Wednesday, Jan. 13, 2021, in Augusta, Maine. (AP Photo / Robert F. Bukaty)

With the FBI warning of potential for violence at all state capitols, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.