Boston bombing suspect Dzhokhar Tsarnaev reportedly left a message in the Watertown, Mass., boat that authorities found him in last month.

Although authorities haven't released the message, several media outlets have reported what sources told them the note entails. CBS News' John Miller, who worked in the Office of the Director of National Intelligence during the Bush administration, reported being told (via NPR):

"(That) the note, scrawled with a pen on the interior wall of the cabin, said the bombings were retribution for what the U.S. did to Muslims in Afghanistan and Iraq, and called the Boston victims collateral damage in the way Muslims have been in the U.S.-driven wars. When you attack one Muslim, you attack all Muslims, the note added. Dzhokhar said he didn't mourn older brother Tamerlan - the other suspect in the bombings - and said Tamerlan was a martyr in a paradise by then - and that Dzhokhar expected to join him there."

CNN also reported an unidentified law enforcement official as telling them similar details:

"Boston Marathon bombing victims were collateral damage in a strike meant as payback for U.S. wars in Muslim lands, the surviving suspect wrote in a message scribbled on the boat where he was found hiding."

Dzhokhar has told investigators "mainly the same details" in an interrogation after his capture, CNN's source added.

Dzhokhar, 19, and his brother Tamerlan Tsarnaev, 26, are accused of planting two bombs on April 15 at the Boston Marathon. The bombs detonated, killing three people and wounding more than 250. 

Tamerlan was killed on April 19 during a gunfight with authorities.  Dzhokhar was seriously wounded and took refuge in a boat in the backyard of a Watertown, Mass., home.  Authorities found and arrested him later that evening.

He is currently awaiting trial on the charge of using a weapon of mass destruction.