Questions remain about motive in Friday's Capitol attack

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Authorities were searching the suspect's social media posts for clues.
• 6 min read
New concerns over security in Washington, D.C. after driver killed officer
The assailant rammed a barricade and killed one Capitol Police officer and injured another before he was killed by police.J. Scott Applewhite/AP
Authorities continue to search for a motive in the deadly vehicle ramming attack at the Capitol that left one Capitol Police officer dead and another officer injured.
The suspect, Noah Green, was killed by police after he exited his vehicle and moved towards officer with a knife, authorities said.

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