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A look at Boston Marathon bombing, investigation

Published on NewsOK Modified: May 1, 2013 at 6:21 pm •  Published: May 1, 2013
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A look at the basics of the investigation into the April 15 Boston Marathon bombing:

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THE LATEST

Three college friends of suspected bomber Dzhokhar Tsarnaev were arrested Wednesday for allegedly removing a backpack containing hollowed-out fireworks from Tsarnaev's room three days after the bombing. Authorities said the trio of 19-year-olds concluded their friend was involved in the bombing after seeing news reports that included pictures of the suspects. Two students from Kazakhstan were charged with conspiring to obstruct justice by concealing and destroying evidence, while the third student was charged with lying to investigators.

The FBI said that about a month before the bombing, Tsarnaev had told two of the men he knew how to make a bomb.

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THE NEW SUSPECTS

Azamat Tazhayakov and Dias Kadyrbayev, both from Kazakhstan, have been held in jail for more than a week on allegations they violated their student visas by not regularly going to class at the University of Massachusetts at Dartmouth. At a court appearance Wednesday, they did not request bail and will be held for another hearing May 14. Attorneys for both men said their clients had nothing to do with the bombing and were shocked by the crime. Kadyrbayev's car had a souvenir license plate that read "Terrorista (hash)1" that his attorney said was a gag gift about his penchant for partying.

Robel Phillipos graduated from the prestigious Cambridge Rindge and Latin High School with Tsarnaev. He was held for a hearing scheduled for Monday.

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THE BOMBING

Authorities say brothers Dzhokhar and Tamerlan Tsarnaev, ethnic Chechens from Russia, fashioned two bombs out of ordinary kitchen pressure cookers and set them off about 10 seconds apart near the finish line of the Boston Marathon. The explosions ripped off limbs and sent shrapnel flying, killing three people and wounding more than 260. Investigators believe the brothers were motivated by a radical brand of Islam, although they do not seem connected to any Muslim terrorist groups.

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