Terrorism in Boston Article

As the world hunted him, the younger brother suspected in the Boston Marathon bombings acted like any other college sophomore.

Dzhokar Tsarnaev, 19, was on the campus of University of Massachusetts-Dartmouth every day after the attack until late Thursday, a university official told CNN. Tsarnaev attended classes and dorm parties while the rest of Boston came to a tense standstill.

A student at the school told The Boston Globe that she saw Tsarnaev at a party Wednesday night that was attended by some of his friends from intramural soccer.

"He was just relaxed," she said, asking the paper not to print her name.

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The days-long drama that gripped Boston -- and the world -- began when two homemade bombs made from pressure cookers exploded 12 seconds apart near the finish line of Monday's Boston Marathon. Three people were killed, and more than 170 injured as nails, ball bearings, BBs and shards of broken glass were blasted through the viewing area.

Law enforcement officials combed through photos and surveillance videos, searching for clues to who detonated the bombs. The FBI released photos showing two men they were seeking and asked for the public's help.

At the dorm where Tsarnaev lived, students joked Thursday as they viewed the FBI photos on television, a senior who lived in the suspect's dorm told The Boston Globe.

"We made a joke like, that could be Dzhokar," said Pamala Rolon. "But then we thought it just couldn't be him. Dzhokar? Never."

A tense scene began to unfold Thursday night -- complete with wailing sirens, flashes of blue and red lights, a hail of bullets and explosions from homemade bombs. By early Friday morning, Tsarnaev's older brother, Tamerlan, 26, was dead. Dzhokar Tsarnaev was bleeding as he stole away into the night.

On campus nobody was joking. The school posted a message on its website:...