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Portrait emerges of suspect's relaxed demeanor in days after bombing

Updated at 7:40 p.m. ET

More details have come to light of Dzhokhar Tsarnaev's actions in the days following the Boston Marathon bombing, painting the picture of an extremely calm young man, who continued life as normal despite his alleged actions.

In stills captured minutes after Monday's explosions, Dzhokhar Tsarnaev, in white cap in image above, lower left, is seen calmly walking away from the scene, as pure chaos and pandemonium broke around him.

According to the Boston Globe, Tsarnaev apparently spent a normal day at the University of Massachusetts Dartmouth, where he was enrolled, on Wednesday, two days after the bombings, according to a UMass official.

The UMass official confirmed that the school knew he was there Wednesday because of card swipes, working out at the gym, then sleeping in his single-unit room at the Pine Dale Hall dorm that night; it was not clear if he had been there earlier in the week.

A student, who did not want to be identified, told the Globe she saw Dzhokhar Tsarnaev at a party Wednesday night that was attended by some of his friends with whom he played intramural soccer.

"He was just relaxed," she said.

CBS News correspondent Jim Axelrod spoke with a friend of Dzokhar, who saw him Thursday afternoon in his dorm room. They chatted for about 20 minutes, then Dzokhar said he had to go.

When the friend asked him what he was up to, Dzokhar replied, "I've got some things I need to take care of."

Interviews with friends of Dzhokhar Tsarnaev, describe a young "Americanized" man nicknamed Jahar, who dressed in shorts and t-shirts and played sports such as soccer and basketball.

He was also an active wrestler, and was named a Greater Boston League Winter All-Star for wrestling in 2011.

In high school, he worked as a lifeguard at Harvard, according to the Harvard Crimson. Dzokhar attended Cambridge Rindge and Latin School, the same high school as Ben Affleck and Matt Damon.

In this undated photo provided by Robin Young, Dzhokhar A. Tsarnaev, left, and 'Here & Now' host Robin Young's nephew, right, pose for a photo after graduating from Cambridge Rindge and Latin High School. Robin Young
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There, friends describe Dzokhar as friendly and nice-going.

"He was the class clown. He would just joke around, try and make jokes, get on the teachers nerves, just like a typical class clown," said a young woman who was a classmate of Dzokhar, to CBS affiliate WBZ.

"He was very friendly. Everyone liked him. No one had any problems with him," she added.

After graduating from Cambridge Rindge and Latin School, Dzokhar enrolled as a student at the University of Massachusetts Dartmouth.

There again, friends describe him as a "cool and funny kid", who didn't talk much about home, although his classmates knew he was from Chechnya.

Dzokhar didn't talk about religion either, according to Francis Barry, whose roommate was good friend's with Dzokhar, but Barry told CBS News that Dzokhar said his older brother didn't like the fact that he smoked weed, because his older brother was very religious.

Barry also described Dzokhar as a "real chill, down-to-earth" kid and said he was "totally surprised" to learn he was involved.

However, Barry said that the last time he had seen Dzokhar was in February. After February, Barry said, Jahar kind of dropped off the map. Even people who knew him well said they hadn't seen or heard from him.

Michael Derby, who knew Dzokhar during his freshman year, told, "We mostly played x-box, watched TV, stuff like that. He was a really quiet kid, but when he was talkative he was really funny."

"From what I saw, he was always smiling and laughing. He mentioned his brother was Muslim ... he only brought up his brother once in a while," said Derby.

Derby described his shock at seeing the FBI photos of the suspects Thursday, thinking that one of the suspects did look like Dzokhar.

"When I saw the photo I was with some friends and we all said it resembled Jahar," said Derby. "I was shocked. He was really a normal kid...nothing I ever saw made me think that he would do anything like this," said Derby.

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