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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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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 image taken from video footage shows downtown Nashville, Tennessee, in the seconds before an explosion rocked the area on Dec. 25, 2020. (WTTW News via CNN)

Many details surrounding the Christmas Day bombing in downtown Nashville remain unclear, but the incident has renewed concerns about the rise of domestic terrorism, and the proliferation of racist ideology by white supremacists. 

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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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“Hate has not place in America,” President Donald Trump said Monday, Aug. 5, 2019, after weekend shootings left more than 30 people dead in El Paso, Texas, and Dayton, Ohio.

President Donald Trump condemns hate, but says hateful rhetoric and mental illness are to blame for mass shootings in Dayton and El Paso – not guns.

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(Roger Ho / Lollapalooza 2017)

The annual music festival gets underway Thursday in Grant Park. Why this year’s four-day event comes with tightened security measures.