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A footnote in the complaint says Dzhokhar Tsarnaev told them about a month before the attack that he knew how to make a bomb, but Robert Stahl, an attorney for Mr. Kadyrbayev, said his client did not know of the evidential value of the items and cooperated fully with investigators throughout the process.

Mr. Kadyrbayev “is just as shocked and horrified by the violence in Boston that took place as the rest of the community is. … The government allegations as far as he saw a photo and recognized [Tsarnaev] immediately we dispute, and we’ll be looking forward to proving our case in court,” Mr. Stahl said. “Mr. Kadyrbayev and his family are very sorry for what happened here in Boston, and he did not have anything to do with it.”

Harlan Protass, an attorney for Mr. Tazhayakov, also said his client fully cooperated.

“My client, Azamat Tazhayakov, feels horrible and was shocked to hear that someone he knew at the University of Massachusetts-Dartmouth was involved with the Boston Marathon bombing, just like many other individuals who were interviewed on campus,” Mr. Protass said. “He has cooperated fully with the authorities and looks forward to the truth coming out in this case. I’d like to say also that he considers it an honor to be able to study in the United States and that he feels for the people of Boston who have suffered as a result of the Marathon bombing.”

The two Kazakhs lived together in New Bedford, and Mr. Kadyrbayev’s car, a photo of which appeared on Tsarnaev’s Twitter feed in March, had the souvenir front plate: “Terrorista #1.”

Mr. Phillipos appeared at a separate hearing Wednesday afternoon. He faces eight years in prison and a $250,000 fine and has a hearing scheduled for Monday.

The University of Massachusetts-Dartmouth said in a statement that neither Mr. Kadyrbayez nor Mr. Phillipos was enrolled at the school, about 60 miles south of Boston. Mr. Tazhayakov is enrolled at the school but has been suspended pending the outcome of the case. The school said it would “continue to fully cooperate” with the investigation.

Ongoing investigation

During questioning with law enforcement authorities, Tsarnaev said he and his 26-year-old brother, Tamerlan, acted alone and were motivated by a desire to defend Islam in response to the U.S.-led wars in Iraq and Afghanistan.

Over the weekend, several lawmakers said the FBI was looking at more “persons of interest” in the U.S.

Rep. Peter T. King, New York Republican and former chairman of the House Homeland Security Committee, was skeptical that issues surrounding the new suspects revealed the entire story.

“It’s not like getting rid of a six-pack when someone’s charged with underage drinking,” Mr. King told CNN. “You’re talking about the worst massacre in recent American history and the largest manhunt, and your friend is involved in it, and they’re treating it almost in a casual way. And again, I just think that what the FBI is going to be looking for now is, did they have any knowledge beforehand?”

The two brothers came to the U.S. from the Caucasus, a region on the border of Europe and Asia, a decade ago. Dzhokhar Tsarnaev became a citizen last year. Tamerlan Tsarnaev’s application was held up, reportedly because federal authorities were seeking more information about why the FBI interviewed him in 2011.

Tamerlan Tsarnaev was placed on a government watch list before leaving for a six-month trip to the Russian southern republic of Dagestan last year.

President Obama said at a Tuesday news conference that law enforcement officials have performed in an “exemplary fashion” in response to the bombings.

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