BOSTON — The conviction of a friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev for impeding the investigation into the bombings has his lawyers wondering if anyone else who faces charges connected to the 2013 attack stands a chance of acquittal.

A federal jury on Monday found Azamat Tazhayakov guilty of obstruction of justice and conspiracy for trying to protect Tsarnaev by agreeing with another friend to get rid of a backpack and disable fireworks they took from his dorm room.

Tazhayakov’s lawyers told the jury that it was the other friend, Dias Kadyrbayev, who took the backpack and later threw it away. Prosecutors even acknowledged that Kadyrbayev was the one who actually placed the backpack in the trash. But the jury still convicted Tazhayakov of both charges.

One of Tazhayakov’s lawyers called the verdict “somewhat surprising,” while another predicted it does not bode well for three other men charged with obstruction of justice or lying to investigators in connection with Tsarnaev and his brother, Tamerlan Tsarnaev, who was killed in a shootout with police.

“If Azamat had a difficult time here, everybody else is going to have a worse time because Azamat had the best facts,” said attorney Nicholas Wooldridge.

Matthew Myers, another of Tazhayakov’s attorneys, said it was difficult to try a case “in this culture,” a reference to the emotional impact the bombings had on Boston and surrounding communities. Three people were killed and more than 260 were injured when twin bombs exploded near the finish line in April 2013.