Boston Bombers: Bloodthirsty Brothers Kill 3 and Hurt 264 With Marathon Blast (FPD CASE VAULT)

The death of radical Muslim Tamerlan Tsarnaev and capture of his brother Dzhokhar ended four days of terror after the two set off a pair of deadly bombs during the annual Boston Marathon.

At 2:45 p.m. on April 15, 2013, the streets erupted into mass chaos after the terrorists exploded two shrapnel-filled pressure cooker bombs amongst the throngs of people running in the race and lining the sidewalks to watch.

*WARNING: Contains Graphic Images*

When the billowing smoke finally cleared, three people were left dead and 264 others were wounded, many of whom lost their limbs.

"I saw at least six to seven people down next to me," said doctor Allan Panter, who was standing near the finish line. "One lady expired. One gentleman lost both his (lower) limbs."

Using images from video cameras near the race, the FBI identified their suspects as the Tsarnaev brothers who'd come to America seeking political asylum from the turmoil in their native Chechnya.

Despite finding a good life in the U.S., the ingrates betrayed their new homeland. The FBI asked the public's help in finding them.

But within hours, the desperate brothers shot and killed a university police officer and carjacked a black Mercedes SUV at gunpoint.

The next day, cops caught up with the deadly duo in the town of Watertown. Tamerlan, 26, was wounded in the ensuing shootout. As he was being cuffed, terrified Dzhokhar jumped behind the wheel and took off, running over his brother and killing him.

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Injured Dzhokhar fled the scene but was later caught while hiding in a boat behind a house in Watertown.

Dzhokhar, now 20, has pleaded not guilty to 30 charges, including use of a weapon of mass destruction resulting in death and conspiracy.