Written in pen, the note said the bombers carried out the terrorist act in retaliation for the U.S.' wars in Iraq and Afghanistan. CBS reports:
...the bombings were retribution for U.S. military action in Afghanistan and Iraq, and called the Boston victims collateral damage in the same way Muslims have been in the American-led wars. "When you attack one Muslim, you attack all Muslims," the note added.
Dzhokhar's note said his brother, Tamerlan, who was killed in a shootout, was a "martyr" who was enjoying the splendors of paradise.