The Boston Marathon bombing trial continued on Monday as lawyers on both sides of the case began making their closing arguments.

The 21-year-old suspected terrorist, Dzhokhar Tsarnaev, is currently standing trial for his role in the Boston Marathon attack, which killed three people and injured 264 others on April 15, 2013. Although Tsarnaev has confessed to the crime, his lawyers reiterated their argument that he participated in the bombing when he was 19 years old because he was under the influence of his older brother, Tamerlan, 26. Their goal is to save Tsarnaev, who is facing 30 federal charges, from the death penalty.

"In the past few weeks we have come face to face with tragedy, suffering and grief in dimensions none of us could imagine," defense attorney Judy Clarke told jurors on Monday, reports ABC News.

She added that the jurors saw shocking videos and horrific photos during the trial, before making a reference to 8-year-old Martin Richard, who suffered from a painful death during the 2013 attack.

Clarke also made it clear that the defense team is not trying to justify Tsarnaev's actions. Instead, she made the case that the deceased brother was the mastermind behind the attacks.

"There is no excuse. No one is trying to make one. Planting bombs at the Boston Marathon was a senseless act," she said. "We are not asking you to excuse the conduct, but let's look at the varying roles," Clarke said, adding that the bombings would have never taken place if it was not for Tamerlan.

Prosecutors, on the other hand, argued that Clarke was trying to let her client "dodge full responsibility."

According to Assistant U.S. Attorney Aloke Chakravarty, the defendant "wanted to make a point. He wanted to punish America. So that's what he did. He planted one bomb, his brother planted the other. It was a coordinated attack to maximize the terror," Chakravarty said, according to USA Today.

The prosecutors also replayed surveillance video showing Tsarnaev choosing a spot to plant one of the two pressure cooker bombs that went off at the race. In addition, the government showed the jury gory video footage that captured the screams and chaos that took place after the explosions.

"The evidence speaks for itself," said Chakravarty.