Investigators Search For Clues Behind U.S. Capitol Car Chase And Shooting

After all the chaos and gunfire, still remains the question: Why did a woman with a young child try to drive into a blocked entrance near the White House?

The woman, identified by law enforcement officials as Miriam Carey, was shot dead Thursday, CNN's Joe Johns reports. 

But why?

Investigators searched for clues at the woman's Stamford, Connecticut, home into the evening, law enforcement sources said. Police and bomb squad units surrounded an apartment complex there. But authorities gave little official word on what was found.

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