Clyde Barrow, a public policy professor at the University of Massachusetts-Dartmouth, specializes in the gaming industry.
The younger brother was registered at the University of Massachusetts-Dartmouth, which ordered its campus evacuated on Friday.
According to the University of Massachusetts-Dartmouth, Tazhayakov is enrolled but has been suspended pending the outcome of the case.
Like Kadyrbayev, he is not a current student at the University of Massachusetts-Dartmouth.
All three started at the University of Massachusetts-Dartmouth in 2011, along with Tsarnaev.
Inside was an assortment of fireworks, a jar of Vaseline and a homework assignment sheet from the University of Massachusetts-Dartmouth, among other items.
Afternoon: Azamat Tazhayakov attends a class at the University of Massachusetts-Dartmouth, after which Dzhokhar Tsarnaev drives him home to his New Bedford apartment.
The day seemed like any other at school for the Mercedes-driving 19-year-old later identified as the tweeter: Dzhokhar Tsarnaev, a sophomore at the University of Massachusetts-Dartmouth.
CNN: From backpacks to 'flash-bangs': Boston's week of terror
What is known is that the four young men -- Tsarnaev, Phillipos, Kadyrbayev and Tazhayakov -- enrolled in fall 2011 at the University of Massachusetts-Dartmouth and became friends.
All three are accused of removing items from Tsarnaev's dorm room at the University of Massachusetts-Dartmouth after the bombings, which killed three people and wounded more than 260, federal officials said.
According to a recent study by the Center for Marketing Research at the University of Massachusetts-Dartmouth, 100% of universities surveyed use social media to communicate with students, up from 61% in 2007-08.
CNN: How colleges use, misuse social media to reach students
According to police, Mr Tazhayakov and Mr Kadyrbayev removed items from Dzhokhar Tsarnaev's dormitory room at the University of Massachusetts - Dartmouth, three days after the blasts, including a backpack filled with fireworks remains.
One of the latest focuses of the probe has been a landfill in New Bedford, Massachusetts, a city adjacent to the town where the surviving bombing suspect, Dzhokhar Tsarnaev, attended school at the University of Massachusetts-Dartmouth.
The first in this class of exceptionally dim supernovae was discovered in 2002, noted Robert Fisher, assistant professor of physics at the University of Massachusetts Dartmouth, a co-author of the paper.
Dzhokhar Tsarnaev, whose father has called him a "true angel, " is a 19-year-old student at the University of Massachusetts at Dartmouth.
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