Three college friends of suspected Boston Marathon bomber Dzhokhar Tsarnaev pleaded not guilty Friday to charges that they hindered the investigation of the explosions that killed three people and injured more than 250 others.

Dias Kadyrbayev and Azamat Tazhayakov, 19-year-old exchange students from Kazakhstan, have been accused of removing a laptop and a backpack containing firework containers from Tsarnaev’s dorm room at his request, CBS reports. A third student, 19-year-old Robel Phillipos, has been charged with lying to FBI agents during their investigation.

Court documents indicate that Kadyrbayev received a text message from Tsarnaev three days after the April 15 bombings, suggesting that he “go to my room and take what’s there.” Kadyrbayev and Tazhayakov took the items back to their shared apartment and later threw the backpack in a dumpster, according to prosecutors.

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The two Kazakh nationals are being held without bail and could face deportation or up to 25 years in prison, CNN reports. Phillipos, of Cambridge, Mass., faces up to 16 years in prison. He is free on $100,000 bond but is being monitored electronically.

The three students will appear in court again on Oct. 29. Tsarnaev, who pleaded not guilty to 30 charges related to the bombings, awaits trial.

Read more at CBS.

Reach Executive Producer Chrystal Li here.