Below is the criminal complaint against Azamat Tazhayakov and Dias Kadyrbayev, two acquaintances Dzhokhar Tsarnaev now facing charges in the
Here's the description of the offense:
Wilfully conspire with each other to commit an offense against the United States […] by knowingly destroying, concealing and covering up objects belonging to Dzokhar Tsarnaeve, namely, a backpack containing fireworks and a laptop computer, wih the intent to impede, obstruct, and influence the criminal investigation of the Marathon bombings.