Authorities said the two suspects fatally shot a university police officer then carjacked a man and got involved in a chase with police that resulted in explosives being thrown from their car and an exchange of gunfire.

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Then the bad guys run, maybe leading police on a chase, and are forever more careful, knowing they are being watched.

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The night of Thursday, April 18, authorities say that Dzhokhar and Tamerlan Tsarnaev were on the run -- allegedly responsible for killing a Massachusetts Institute of Technology police officer, carjacking a Mercedes SUV, then tossing explosives and trading gunfire with authorities on a high-speed chase through Boston suburbs.

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