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A man infected with Ebola walked into a Dallas hospital. No one asked him if he had recently traveled and he didn't say, a source says. The man was sent home. Erin Burnett has the latest.
April 22nd, 2013
09:34 PM ET

OutFront investigation: How a pressure-cooker bomb works

About 24 hours before the arrest of Boston bombing suspect Dzhokhar Tsarnaev, a violent gun battle took place with police on the streets of Watertown, Boston - where the two brothers are said to have also tossed a pressure cooker bomb at authorities.

The Tsarnaev brothers used the same weapon during the marathon bombings.

Tonight in an OutFront Investigation, our David Mattingly learns just how easy it is to build and detonate one of these deadly weapons.

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