Boston Marathon bombing suspect: What we know about Dzhokhar and Tamerlan Tsarnaev so far

After a late night police shootout, Boston is on lockdown as authorities search for Dzhokhar Tsarnaev, 19, one of the suspects in the Monday's marathon bombings. Here's what we know about him and his deceased 26-year-old brother, Tamerlan Tsarnaev, so far.

Dzhokhar, who was born July 22, 1993, in Kyrgyzstan, is believed to have attended Cambridge Ringe & Latin School. He graduated in 2011, the same year the city of Cambridge awarded him a $2,500 college scholarship. CBS News and NBC's Pete Williams reported that Dzhokhar Tsarnaev became an American citizen last year on September 11.

According to various reports from Slate, Buzzfeed and other sources, several of Dzhokhar's classmates say he was a "nice kid."

"I saw the pictures last night and thought it looked kind of like him," Dzhokhar's former classmate, Rebecca Mazur, told Buzzfeed. "But I felt mean even thinking that the person in the photos looked like him."

“I just remember seeing him on the wrestling team, just one of the normal kids. He seemed like a nice guy. He hung out with people who I knew as nice people," family friend Nathan Greenberg told Slate.

Here is his high school year book photo:

.@washingtonpost found Dzhokhar Tsarnaev's yearbook photo: washingtonpost.com/blogs/early-le… twitter.com/UPI/status/325…

— UPI.com (@UPI) April 19, 2013

My beloved nephew on right, djohar tsarnaev on left, happy cambridge Rindge and Latin grads.heartbreaking twitter.com/hereandnowrobi…

— Robin Young (@hereandnowrobin) April 19, 2013

Despite numerous fake Twitter accounts that popped up Thursday, Buzzfeed and Gawker's Adrian Chen are confident they identified his real user name, @J_tsar. A cached version of the account features his face as a profile picture:

UMass Dartmouth closed Thursday after reports that Dzhokhar is a registered student there.

The Atlantic Wire has a photo of him enjoying a meal with a friend.

He lived with his older brother at 410 Norfolk Street in Cambridge, Mass.

Dzhokhar's brother, Tamerlan, died in the shootout with police. NBC's Pete Williams reported Thursday morning that Dzhokhar had run over his brother during the getaway.

NBC's Pete Williams saying that at-large suspect drove over his brother in getaway #Bostonbombing #manhunt

— UPI.com (@UPI) April 19, 2013

Tamerlan, 26, was wearing a black hat in FBI photos released Wednesday. He has been linked to an unconfirmed YouTube account by The Washington Post and Mother Jones.

Tamerlan was born October 21, 1986, in Kyrgyzstan. He first arrived in the U.S. in 2003. MSNBC describes Tamerlan as a "prize-winning heavyweight boxer" who wanted to represent the United States at the Olympics. Slate found a photo essay about Tamerlan's training as a boxer in Salt Lake City called "Will Box for Passport."

"I don't have a single American friend, I don't understand them," Tamerlan says in the photo captions. According to Spotcrime.com, Tamerlan was arrested in 2009 for assaulting his girlfriend.

He also described himself as a Muslim and attended Bunker Hill Community College as an engineering student.

The suspects' uncle, Ruslan Tsarni, said he knew his nephews as children, but couldn't explain why they allegedly became violent.

"Being losers, hatred to those who were able to settle themselves. These are the only reasons I can imagine of. Anything else, anything else to do with religion, with Islam, is a fake," he said.