Jurors in the Boston Marathon bombing trial were presented with the message that bombing suspect Dzhokhar Tsarnaev wrote on the inside of a boat that he was hiding in before he was captured by police.

The 21-year-old suspected terrorist is facing 30 charges and the death penalty for his role in the Boston Marathon attack, which killed three people and injured 264 others on April 15, 2013. According to his defense team, Tsarnaev participated in the bombing when he was 19 years old because he was dominated and motivated by his now-deceased older brother, Tamerlan, 26. Tamerlan died three days after the marathon bombing during a shootout with police.

On Tuesday, Boston Police Officer Todd Brown, who is a member of the department's bomb squad, testified that he discovered Tsarnaev's handwritten note inside of the boat while he was searching it for a bomb. In the message, the former University of Massachusetts Dartmouth student explained why he killed innocent people during the attack. Although the message contained blood stains and bullet holes, the message was still legible.

"We Muslims are one body you hurt one you hurt us all," the message read, citing what it said was aggression in Muslim lands, reports Reuters.

"I bear witness that there is no God but Allah and that Muhammad is his messenger...U.S. Government is killing our innocent civilians. Now I don't like killing innocent people it is forbidden in Islam but due to said [bullet hole] it is allowed. All credit goes [bullet hole]," it continued, according to The Boston Globe.

Also on Tuesday, FBI agent Stephen Kimball testified Tsarnaev attended the 2012 Boston Marathon and posted an ominous tweet on the same day of the renowned race. He stated that Tsarnaev used the Twitter handle @J_Tsar to write, "They will spend their money and they will regret it and then they will be defeated," on April 16, 2012.

However, while being cross-examined by the defense, Kimball said that the Tsarnaev also posted rap lyrics and jokes on Twitter.

"Is it fair to say that in addition to the 45 tweets that the government chose for you to introduce, there are a lot of tweets about things like girls, cars, food, sleep, homework, complaining about studying?" she said.

"Yes," Kimball responded.

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