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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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An American flag and Trump campaign flag fly at a Proud Boys rally ahead of the 2020 presidential election. (WTTW News via CNN)

An estimated 21 million Americans believe that Joe Biden is an illegitimate president and that Donald Trump should be restored to the White House by force, according to a new report from the University of Chicago. We discuss the findings with political science professor Robert Pape, who led the survey.

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Pro-Trump supporters breach security gates at the U.S. Capitol on Jan. 6, 2021. (WTTW News via CNN)

A new analysis from the University of Chicago looked at the demographics of the 377 individuals arrested for the Jan. 6 attack. The study’s author said he had expected to discover something about the economic conditions of the rioters but was surprised that the data told a very different story.

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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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Protesters storm the U.S. Capitol on Wednesday, Jan. 6, 2021. (WTTW News via CNN)

“I was not surprised by the violence,” said Tom Mockaitis, a security and terrorism specialist. “I was surprised and appalled by how poorly prepared to defend the United States Capitol the security apparatus was.” 

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An American flag and Trump campaign flag fly at a Proud Boys rally. (WTTW News via CNN)

In an op-ed, DePaul University history professor Tom Mockaitis says the president’s failure last week to recognize and condemn violent, far-right groups like the Proud Boys could encourage clashes on Nov. 3.

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An overcrowded hospital in Brooklyn deals with COVID-19 cases. (WTTW News via CNN)

Could hospitals and supermarkets become targets for terror groups looking to exploit the pandemic to advance their racist agenda? We speak with international terrorism expert Robert Pape.

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President Donald Trump’s decision to immediately withdraw all U.S. troops from northern Syria has prompted criticism from politicians, military leaders and others. 

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“I think a lot of restraint has been shown by us. A lot of restraint. That doesn’t mean we’re going to show it in the future,” President Donald Trump said Monday, June 24, 2019 in announcing new economic sanctions against Iran.

New economic sanctions on Iran: will they prevent a military showdown? Robert Pape, director of the University of Chicago Project on Security and Threats, offers his insight.

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White House national security adviser H.R. McMaster believes the U.S. is inching closer to war with North Korea.

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What will the new world order look like under Donald Trump? Looking at the president-elect and his foreign policy promises.

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Ukrainian separatists have returned the bodies of those who died in the recent plane crash after much negotiation. We have the latest on the situation in Ukraine after a Malaysian Airlines plane was shot down near the Russian border.

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A Malaysia Airlines plane crashes in the politically heated Ukrainian territory. Was it an accident or terrorism? And could the incident touch off new international tensions. 

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The U.S. and its allies are gearing up for a military response against Syrian President Bashar al-Assad’s alleged use of large-scale chemical weapons against his own people in Syria’s ongoing civil war. We take a closer look at the escalating tensions.

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The State Department issues a worldwide travel alert and the temporary closure of 19 embassies and consulates. We look at the latest terror threats with Robert Pape, Professor of Political Science at the University of Chicago. View a map of the closures and charts on attacks.

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Ninian Reid / flickr

The FBI says it will go to "the ends of the Earth" to find those responsible for the Boston Marathon bombing. We hear from security and terrorism experts on what clues we know so far, and how agencies plan for similar attacks.