Three Charged With Hindering Inquiry Into Boston Attack By MICHAEL WINES and KATHARINE Q. SEELYE They were perhaps Dzhokhar Tsarnaev’s closest friends during his two years at college, an American classmate from high school and two Russian-speaking students from Kazakhstan. The Kazakhs seemingly had money and drove expensive cars. They entertained Mr. Tsarnaev at their off-campus apartment, and he partied with them in New York. One of them lent Mr. Tsarnaev a black BMW after he smashed his Honda Civic in an accident.   Two of the men charged, Azamat Tazhayakov and Dias Kadyrbayev, with Dzhokhar Tsarnaev in Times Square, in a photo from the social network VK.    One of those charged, Dias Kadyrbayev, left, with the surviving suspect, Dzhokhar Tsarnaev, in a photo from the social network VK.                               And in the wake of the twin bombs that exploded last month at the finish line of the Boston Marathon, federal prosecutors now say, the three showed just how close their friendship was: two of them decided to put a backpack and fireworks linking Mr. Tsarnaev to the blasts into a black trash bag, and toss it into a Dumpster. Prosecutors say the third later lied to investigators when asked about it. The two Kazakhs, Dias Kadyrbayev and Azamat Tazhayakov, were charged on Wednesday with destroying evidence to obstruct the federal inquiry into the marathon bombing. Their American friend, Robel K. Phillipos, was charged with lying to impede the investigation. The story behind their arrest, detailed in lengthy affidavits, paints a vivid portrait of Mr. Tsarnaev in the days after the bombing, and portrays a dorm-room scene of confusion as the three young men, stunned to realize that their friend was being sought as a terrorist, debated whether and how to help him. And it chillingly laid bare the skill with which Mr. Tsarnaev appears to have concealed plans for the bombing from even his most intimate associates. Three days after the blasts, as photographs of the then unidentified bombing suspects blanketed television and the Internet, Mr. Kadyrbayev sent Mr. Tsarnaev a text message: one of the photographs, he wrote, bore a marked resemblance to him. “lol,” Mr. Tsarnaev coolly replied. “you better not text me.” He added: “come to my room and take whatever you want.” Mr. Kadyrbayev told federal authorities he thought the request was a joke. Only later that evening, he told interrogators, would he come to see it as a thinly veiled plea to cover up his crime. Should the three men be found guilty, they would face potentially stiff penalties: up to five years in prison for the two Kazakhs, eight years for Mr. Phillipos, and up to $250,000 fines for each of the three. Mr. Kadyrbayev, 19, and Mr. Tazhayakov, 20, have been held in jail since last week, ostensibly on suspicion of violating their student visas by not attending class at the University of Massachusetts at Dartmouth, where they had studied with Mr. Tsarnaev. All four men entered classes there in the fall of 2011, but Mr. Phillipos dropped out and returned to Cambridge, where he and Mr. Tsarnaev had attended Cambridge Ringe and Latin High School together. A university spokesman said that Mr. Kadyrbayev was not currently enrolled, and that Mr. Tazhayakov remained a student but had been suspended until the charges against him are  resolved. In one respect, the two Kazakh students seem an odd match for Mr. Tsarnaev and Mr. Phillipos. Sent from oil-rich Kazakhstan to study in the United States, Mr. Tazhayakov and Mr. Kadyrbayev appear to have come from wealthy families. Mr. Kadyrbayev’s Facebook page features photographs of him on beaches in Fort Lauderdale and Dubai. Mr. Tazhayakov’s page indicates he comes from Atyrau, a petroleum center at the mouth of the Ural River. By contrast, the Cambridge homes of both Mr. Tsarnaev and Mr. Phillipos are hard-worn apartment houses in working-class neighborhoods. But the four quickly became close after starting classes, the affidavit and interviews with friends suggest, in part because Mr. Tsarnaev and the two Kazakh students all spoke fluent Russian. Mr. Tazhayakov struck up a friendship with Mr. Tsarnaev first, and appeared the closest to him, said Jason Rowe, a sophomore who was Mr. Tsarnaev’s freshman dorm roommate. A Cambridge friend of Mr. Tsarnaev said their friendship began to ebb after Mr. Tsarnaev met the two Kazakhs. Photographs posted online suggest a deepening relationship with the foreign students; in one undated shot, Mr. Tsarnaev drapes an arm over a broadly smiling Mr. Kadyrbayev as the two sit at a kitchen table, plates of food laid out before them. Despite dropping out of school and returning to Cambridge, Mr. Phillipos also appears to have become fast friends with the Kazakh students, visiting them frequently in the apartment they shared in New Bedford, about three miles from the Dartmouth campus. New York Times