Dzhokhar Tsarnaev, 19, the younger of the two Boston marathon bombing suspects, wrote a note while hiding in the boat confessing to carrying out the attacks out of revenge, according to a CBS News report that surfaced Thursday.

Tsarnaev wrote the note on the interior wall of the boat with a marker, sources told CBS News senior correspondent John Miller.

"When you attack one Muslim, you attack all Muslims," Tsarnaev wrote, according to anonymous sources that spoke to Miller.

In the note, Tsarnaev said that the Boston bombings were retribution for U.S. military actions in Afghanistan and Iraq and called those who died or were injured in the Boston attacks "collateral damage," comparing it to the same way that Muslims have been in the wars in those countries.

He also said that he didn't mourn his older brother, Tamerlan Tsarnaev, who was the mastermind behind the bombings, because he was a martyr in paradise and "he expected to join him there soon," CBS reports.

The content of the note match the declaration Tsarnaev made at his hospital bed reported by the Washington Times. According to the report, citing U.S. officials, Tsarnaev said that the American wars in Iraq and Afghanistan motivated him and his brother to carry out the bombings.

The 19-year-old suspect was captured alive but in critical condition on April 19 after hiding for several hours inside a boat in Watertown, Mass.

His older brother was killed in a police shootout hours after they were identified as the bombing suspects and killed a police officer at the MIT campus April 18. Dzhokhar managed to escape but within 24 hours of his brother's death, he was arrested.

The twin bombings at the Boston marathon finish line killed three innocent victims and injured over 200 people. The aftermath was that of a warzone and many had their limb(s) amputated.