News of the additional three arrests has the students at MIT buzzing.
That’s where the police officer was killed the day of the bombings.
Andrew Lamson, of Tulsa, didn't know about the three additional arrests until KRMG called Wednesday morning.
He says, “The mood around here has been pretty tense. People are still pretty cautious.”
Several police calls since the bombings haven’t helped lighten the feeling.
Lamson tells KRMG, “There have been several suspicious package reports on the campus in particular. I feel like that’s a direct result of what happened.”
He says everyone was hoping the group responsible wouldn't end up being from an organized terrorist group.
Azamat Tazhayakov and Dias Kadyrbayev had their initial court appearance Wednesday afternoon.
Their attorney says the clients were shocked after the bombings and they didn't have anything to do with the attack.
They are accused of removing a backpack containing hollowed-out fireworks from suspect Dzhokhar Tsarnaev's dorm room three days after the attack to keep him from getting into trouble.
A third man, Robel Phillipos, is charged with making false statements to federal investigators.