Three men have been arrested on charges of conspiring to obstruct justice and making false statements in the Boston Marathon Bombing investigation. The men were college friends of Dzhokhar Tsarnaev and are alleged to have removed evidence from his dorm room.

Three college friends of Boston Marathon bombing suspect Dzhokhar Tsarnaev were accused Wednesday of removing evidence from his dorm room as new details about the case emerged in court papers.

Criminal complaints against the trio revealed that Tsarnaev cut his long hair after the April 15 attack but before the FBI released his photo and that he allegedly told friends a month earlier that he knew “how to make a bomb.”

The court papers also suggest that the 19-year-old suspect was practically blasé when one of the friends texted to say he looked like the man in the FBI photos of the bomb suspect.

The criminal complaint charges Azamat Tazhayakov and Dias Kadyrbayev with conspiring to obstruct justice and Robel Phillipos with making false statements.

The three friends, who are all 19-years-old, allegedly went to Tsarnaev’s dorm room after the FBI photos came out April 18 and left with a backpack that contained fireworks tubes that had been emptied of their explosive powder, according to the documents.

The backpack was later tossed in the garbage, though the suspects’ gave conflicting statement about whether that happened before or after Tsarnaev had been publicly named as the bombing suspect following a night of bloody mayhem.

It remains unclear of any of the three knew the bombing would happen or provided any assistance to Tsarnaev prior to the Boston Marathon bombing. All the charges relate to actions done after the bombing.