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According to federal court documents, all three were classmates of Dzhokhar Tsarnaev's from the University of Massachusetts at Dartmouth, and they saw him after the bombings. When the FBI released photos of the bombing suspects on April 18, Phillipos texted Kadyrbayev to say that one of the suspects looked like Tsarnaev. According to the filing, Kadyrbayev saw the photo and then texted Tsarnaev to tell him the same thing.
"LOL," Tsarnaev replied, according to the filing. The suspected bomber told his friend to "come to my room and take whatever you want"—though Kadyrbayev told federal authorities he regarded that comment as a joke.
But Tazhayakov told investigators that upon seeing those texts, he believed he would never see Tsarnaev alive again.
Later that night, Kadyrbayev and Tazhayakov, who shared an apartment off campus, met Phillipos at Tsarnaev's dorm room, where they spied a backpack containing fireworks that were "opened and emptied of powder" and other possible bomb-making components, according to court filings. Kadyrbayev allegedly told officials he knew at that moment that Tsarnaev was involved in the bombings, but instead of alerting police, he decided to remove the backpack and Tsarnaev's laptop from the dorm to help his friend "avoid trouble."
The three stayed up all night watching bombing coverage, and amid reports that Tsarnaev was on the run, Kadyrbaev says they collectively decided to throw the backpack and laptop in a trash bin near the apartment he shared with Tazhayakov in New Bedford, according to the court filings. But Phillipos offered up a slightly different story, telling authorities he could not understand the "majority" of what his friends were saying because they were speaking in Russian. When asked by Kadrybaev what he thought he should do with Tsarnaev's items, Phillipos says he replied, "Do what you have to do."
Federal investigators interviewed Tazhayakov and Kadyrbayev on April 19 and, on April 20, they were detained on civil immigration violations. They have been in federal custody since then. The two
appeared in immigration court Wednesday morning. Court filings suggest the two came clean early on about their efforts to conceal evidence related to Tsarnaev's alleged role in the bombings.
But federal officials have charged Phillipos with repeatedly lying to investigators about his role—insisting again and again that he didn't remember going to Tsarnaev's dorm room or removing possible evidence. But during his fourth interview on April 26, Phillipos allegedly admitted he had lied to federal agents and signed a confession detailing his role in the cover-up.
On April 26, federal investigators found Tzarnaev's backpack at a nearby landfill, according to court documents. It's unclear if the his laptop has been recovered.