The note called the Boston victims “collateral damage” and called to avenge Muslims killed in other conflicts around the world.

"When you attack one Muslim, you attack all Muslims," the note read, saying that the bombings were a response to the U.S. wars in Afghanistan and Iraq.

Sources told CBS News that Tsarnaev, the lone surviving suspect, wrote the note on the wall of a boat where he hid just before police captured him.

The writing was reportedly riddled with bullet holes because of shots fired into the boat as police apprehended Tsarnaev.

Police captured Tsarnaev in April after a multiday manhunt that resulted in the death of Dzhokhar's brother, Tamerlan.