Dzhokhar Tsarnaev, the accused in Boston Marathon bombing, who was found hiding in a boat days after the blasts, left a handwritten message describing the attack as retribution for US wars in Muslim countries, an American news channel has reported.

The CBS News report on Thursday cited anonymous sources and said that Tsarnaev used a pen to write the message on an interior wall of the boat, where police found him bleeding from bullet wounds four days after the April 15 bombing.

The note summed up with the idea that "when you attack one Muslim, you attack all Muslims", CBS News reported.

Al Jazeera is unable to independently verify this report and Reuters news agency said that an FBI spokeswoman in Boston did not immediately return a call seeking comment.

Boston bombing suspect charged

The CBS report said Tsarnaev, 19, described his older brother and fellow suspect Tamerlan Tsarnaev, 26, who died in a gun battle with police, as "a martyr".

"Basically, the note says the bombings were retribution for the US crimes against Muslims in places like Iraq and Afghanistan and that the victims of the Boston bombing were 'collateral damage,' the same way innocent victims have been collateral damage in US wars around the world," John Miller, CBS News reporter and a former spokesman for the FBI, said.

The bombings at the finish line of the world-famous marathon killed three people and injured 264 others. The FBI identified the ethnic Chechen brothers as suspects from video and pictures at the scene.

Dzhokhar Tsarnaev was arrested in Watertown, Massachusetts, on April 19 after a daylong manhunt and lockdown of much of the Boston area.

He is being held in a prison hospital west of Boston and faces charges that could carry the death penalty if
he is convicted.

Source: Reuters